diff --git a/.drone.yml b/.drone.yml
index 32a20290..41538e58 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -15,7 +15,10 @@ pipeline:
     volumes:
     - /cache:/cache
     commands:
-    - composer update --prefer-lowest --ansi
+    # @todo remove "composer install" step once the following issue is fixed.
+    # @link https://webgate.ec.europa.eu/CITnet/jira/browse/OPENEUROPA-1234
+    - composer install --ansi --no-suggest --no-progress
+    - composer update --prefer-lowest --ansi --no-suggest --no-progress
     when:
       matrix:
         COMPOSER_BOUNDARY: lowest
@@ -26,7 +29,7 @@ pipeline:
     volumes:
     - /cache:/cache
     commands:
-    - composer install --ansi
+    - composer install --ansi --no-suggest --no-progress
     when:
       matrix:
         COMPOSER_BOUNDARY: highest
diff --git a/composer.json b/composer.json
index c1c3099a..3daf81a1 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "require": {
-        "consolidation/robo": "^1.2.2",
+        "consolidation/robo": "^1.3",
         "gitonomy/gitlib": "^1.0",
         "nuvoleweb/robo-config": "^0.2.1",
         "jakeasmith/http_build_url": "^1.0.1"
diff --git a/config/commands/drupal.yml b/config/commands/drupal.yml
index 4d72932f..0610838a 100644
--- a/config/commands/drupal.yml
+++ b/config/commands/drupal.yml
@@ -27,3 +27,8 @@ command:
     drush-setup:
       options:
         config-dir: ${drupal.root}/drush
+    settings-setup:
+      options:
+        sites-subdir: ${drupal.site.sites_subdir}
+        settings-override-file: ${drupal.site.settings_override_file}
+        force: ${drupal.site.force}
diff --git a/config/runner.yml b/config/runner.yml
index 9475e9d2..07af8532 100644
--- a/config/runner.yml
+++ b/config/runner.yml
@@ -32,6 +32,7 @@ drupal:
     locale: "en"
     sites_subdir: "default"
     config_dir: ~
+    settings_override_file: "settings.override.php"
 
   # Administrator account information.
   account:
diff --git a/src/Commands/DrupalCommands.php b/src/Commands/DrupalCommands.php
index 88e7e29b..04e0e962 100644
--- a/src/Commands/DrupalCommands.php
+++ b/src/Commands/DrupalCommands.php
@@ -134,7 +134,7 @@ public function siteInstall(array $options = [
         }
 
         $drush = $this->getConfig()->get('runner.bin_dir').'/drush';
-        $task  = $this->taskDrush($drush)
+        $task = $this->taskDrush($drush)
             ->root($options['root'])
             ->siteName($options['site-name'])
             ->siteMail($options['site-mail'])
@@ -255,11 +255,13 @@ public function drushSetup(array $options = [
     }
 
     /**
-     * Setup default Drupal settings file.
+     * Setup Drupal settings overrides.
      *
-     * This command will append settings specified at "drupal.settings" to the
-     * current site's "default.settings.php" which, in turn, will be used
-     * to generate the actual "settings.php" at installation time.
+     * This command will:
+     *
+     * - Copy "default.settings.php" to "settings.php", which will be overridden if existing
+     * - Append to "settings.php" an include operation for a "settings.override.php" file
+     * - Write settings specified at "drupal.settings" in "settings.override.php"
      *
      * Default settings can be customized in your local runner.yml.dist/runner.yml
      * as shown below:
@@ -270,20 +272,61 @@ public function drushSetup(array $options = [
      * >       sync: '../config/sync'
      * >       prod: '../config/prod'
      *
+     * The settings override file name can be changed in the Task Runner
+     * configuration by setting the "drupal.site.settings_override_file" property.
+     *
      * @command drupal:settings-setup
      *
-     * @option root Drupal root.
+     * @option root                     Drupal root.
+     * @option sites-subdir             Drupal site subdirectory.
+     * @option settings-override-file   Drupal site settings override filename.
+     * @option force                    Drupal force generation of a new settings.php.
      *
      * @param array $options
      *
      * @return \Robo\Collection\CollectionBuilder
      */
     public function settingsSetup(array $options = [
-      'root' => InputOption::VALUE_REQUIRED,
+        'root' => InputOption::VALUE_REQUIRED,
+        'sites-subdir' => InputOption::VALUE_REQUIRED,
+        'settings-override-file' => InputOption::VALUE_REQUIRED,
+        'force' => false,
     ])
     {
-        return $this->collectionBuilder()->addTaskList([
-            $this->taskAppendConfiguration($options['root'].'/sites/default/default.settings.php', $this->getConfig())->setConfigKey('drupal.settings'),
-        ]);
+        $settings_default_path = $options['root'] . '/sites/' . $options['sites-subdir'] . '/default.settings.php';
+        $settings_path = $options['root'] . '/sites/' . $options['sites-subdir'] . '/settings.php';
+        $settings_override_path = $options['root'] . '/sites/' . $options['sites-subdir'] . '/' . $options['settings-override-file'];
+
+        // Save the filename of the override file in a single variable to use it
+        // in the heredoc variable $custom_config hereunder.
+        $settings_override_filename = $options['settings-override-file'];
+
+        $custom_config = <<< EOF
+
+/**
+ * Include Drupal settings overrides.
+ *
+ * The following file is generated by the openeuropa/task-runner project
+ * using configuration from your local "runner.yml.dist/runner.yml" files.
+ *
+ * Keep this code block at the end of the file.
+ */
+if (file_exists(\$app_root . '/' . \$site_path . '/$settings_override_filename')) {
+  include \$app_root . '/' . \$site_path . '/$settings_override_filename';
+}
+EOF;
+        $collection = [];
+
+        if (true === (bool) $options['force'] || !file_exists($settings_path)) {
+            $collection[] = $this->taskFilesystemStack()->copy($settings_default_path, $settings_path, true);
+            $collection[] = $this->taskWriteToFile($settings_path)->append()->lines([$custom_config]);
+        }
+
+        $collection[] = $this->taskWriteConfiguration(
+            $settings_override_path,
+            $this->getConfig()
+        )->setConfigKey('drupal.settings');
+
+        return $this->collectionBuilder()->addTaskList($collection);
     }
 }
diff --git a/tests/AbstractTest.php b/tests/AbstractTest.php
index fcbc5220..ef3134ad 100644
--- a/tests/AbstractTest.php
+++ b/tests/AbstractTest.php
@@ -79,4 +79,18 @@ protected function getSandboxRoot()
     {
         return __DIR__."/sandbox";
     }
+
+    /**
+     * Generate a random string.
+     *
+     * @param int $length
+     *   The desired length.
+     *
+     * @return string
+     *   The random string.
+     */
+    protected function generateRandomString($length = 10)
+    {
+        return substr(str_shuffle(str_repeat($x = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', ceil($length/strlen($x)))), 1, $length);
+    }
 }
diff --git a/tests/CommandsTest.php b/tests/CommandsTest.php
index c2fd08a9..a34fdd6f 100644
--- a/tests/CommandsTest.php
+++ b/tests/CommandsTest.php
@@ -146,15 +146,98 @@ public function testSettingsSetup(array $config, array $expected)
 
         file_put_contents($configFile, Yaml::dump($config));
 
+        $sites_subdir = isset($config['drupal']['site']['sites_subdir']) ? $config['drupal']['site']['sites_subdir'] : 'default';
+        mkdir($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/', 0777, true);
+        file_put_contents($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/default.settings.php', '');
+
         $input = new StringInput("drupal:settings-setup --working-dir=".$this->getSandboxRoot());
         $runner = new TaskRunner($input, new BufferedOutput(), $this->getClassLoader());
         $runner->run();
 
+        foreach ($expected as $row) {
+            $content = file_get_contents($this->getSandboxFilepath($row['file']));
+            $this->assertContainsNotContains($content, $row);
+        }
+
+        // Generate a random function name.
+        $fct = $this->generateRandomString(20);
+
+        // Generate a dummy PHP code.
+        $config_override_dummy_script = <<< EOF
+<?php 
+function $fct() {}
+EOF;
+
+        $config_override_filename = isset($config['drupal']['site']['settings_override_file']) ?
+            $config['drupal']['site']['settings_override_file'] :
+            'settings.override.php';
+
+        // Add the dummy PHP code to the config override file.
+        file_put_contents(
+            $this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/' . $config_override_filename,
+            $config_override_dummy_script
+        );
+
+        // Include the config override file.
+        include_once $this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/' . $config_override_filename;
+
+        // Test if the dummy PHP code has been properly included.
+        $this->assertTrue(\function_exists($fct));
+    }
+
+    /**
+     * @param array $config
+     * @param array $expected
+     *
+     * @dataProvider settingsSetupForceDataProvider
+     */
+    public function testSettingsSetupForce(array $config, array $expected)
+    {
+        $configFile = $this->getSandboxFilepath('runner.yml');
+        file_put_contents($configFile, Yaml::dump($config));
+
+        $sites_subdir = isset($config['drupal']['site']['sites_subdir']) ? $config['drupal']['site']['sites_subdir'] : 'default';
+        mkdir($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/', 0777, true);
+        file_put_contents($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/default.settings.php', '');
+        file_put_contents($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/settings.php', '# Already existing file.');
+
+        $input = new StringInput('drupal:settings-setup --working-dir=' . $this->getSandboxRoot());
+
+        if (true === $config['drupal']['site']['force']) {
+            $input = new StringInput('drupal:settings-setup --working-dir=' . $this->getSandboxRoot() . ' --force');
+        }
+        $runner = new TaskRunner($input, new BufferedOutput(), $this->getClassLoader());
+        $runner->run();
 
         foreach ($expected as $row) {
             $content = file_get_contents($this->getSandboxFilepath($row['file']));
             $this->assertContainsNotContains($content, $row);
         }
+
+        // Generate a random function name.
+        $fct = $this->generateRandomString(20);
+
+        // Generate a dummy PHP code.
+        $config_override_dummy_script = <<< EOF
+<?php 
+function $fct() {}
+EOF;
+
+        $config_override_filename = isset($config['drupal']['site']['settings_override_file']) ?
+            $config['drupal']['site']['settings_override_file'] :
+            'settings.override.php';
+
+        // Add the dummy PHP code to the config override file.
+        file_put_contents(
+            $this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/' . $config_override_filename,
+            $config_override_dummy_script
+        );
+
+        // Include the config override file.
+        include_once $this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/' . $config_override_filename;
+
+        // Test if the dummy PHP code has been properly included.
+        $this->assertTrue(\function_exists($fct));
     }
 
     /**
@@ -200,6 +283,14 @@ public function settingsSetupDataProvider()
         return $this->getFixtureContent('commands/drupal-settings-setup.yml');
     }
 
+    /**
+     * @return array
+     */
+    public function settingsSetupForceDataProvider()
+    {
+        return $this->getFixtureContent('commands/drupal-settings-setup-force.yml');
+    }
+
     /**
      * @return array
      */
@@ -223,8 +314,8 @@ public function changelogDataProvider()
     protected function assertContainsNotContains($content, array $expected)
     {
         $this->assertContains($expected['contains'], $content);
-        if (!empty($row['not_contains'])) {
-            $this->assertNotContains($row['not_contains'], $content);
+        if (!empty($expected['not_contains'])) {
+            $this->assertNotContains($expected['not_contains'], $content);
         }
     }
 }
diff --git a/tests/fixtures/commands/drupal-settings-setup-force.yml b/tests/fixtures/commands/drupal-settings-setup-force.yml
new file mode 100644
index 00000000..be04d9d7
--- /dev/null
+++ b/tests/fixtures/commands/drupal-settings-setup-force.yml
@@ -0,0 +1,17 @@
+- configuration:
+    drupal:
+      site:
+        force: false
+  expected:
+    - file: "build/sites/default/settings.php"
+      contains: "# Already existing file."
+      not_contains: "include $app_root . '/' . $site_path . '/settings.override.php';"
+
+- configuration:
+    drupal:
+      site:
+        force: true
+  expected:
+    - file: "build/sites/default/settings.php"
+      contains: "include $app_root . '/' . $site_path . '/settings.override.php';"
+      not_contains: "# Already existing file."
diff --git a/tests/fixtures/commands/drupal-settings-setup.yml b/tests/fixtures/commands/drupal-settings-setup.yml
index 58ae4355..53938b35 100644
--- a/tests/fixtures/commands/drupal-settings-setup.yml
+++ b/tests/fixtures/commands/drupal-settings-setup.yml
@@ -8,9 +8,12 @@
             - "vendor"
             - "${drupal.root}"
   expected:
-    - file: "build/sites/default/default.settings.php"
+    - file: "build/sites/default/settings.override.php"
       contains: "$conf[\"file_scan_ignore_directories\"] = array(0 => 'node_modules',1 => 'bower_components',2 => 'vendor',3 => 'build');"
       not_contains: ~
+    - file: "build/sites/default/settings.php"
+      contains: "include $app_root . '/' . $site_path . '/settings.override.php';"
+      not_contains: ~
 
 - configuration:
     drupal:
@@ -19,7 +22,7 @@
           file_scan_ignore_directories:
             - "${drupal.root}"
   expected:
-    - file: "build/sites/default/default.settings.php"
+    - file: "build/sites/default/settings.override.php"
       contains: "$settings[\"file_scan_ignore_directories\"] = array(0 => 'build');"
       not_contains: ~
 
@@ -27,6 +30,39 @@
     drupal:
       settings: []
   expected:
-    - file: "build/sites/default/default.settings.php"
+    - file: "build/sites/default/settings.override.php"
       contains: "// Start settings processor block."
       not_contains: "file_scan_ignore_directories"
+
+- configuration:
+    drupal:
+      settings:
+        settings:
+          file_scan_ignore_directories:
+            - "${drupal.root}"
+      site:
+        settings_override_file: "settings.overridemeplease.php"
+  expected:
+    - file: "build/sites/default/settings.overridemeplease.php"
+      contains: "$settings[\"file_scan_ignore_directories\"] = array(0 => 'build');"
+      not_contains: ~
+    - file: "build/sites/default/settings.php"
+      contains: "include $app_root . '/' . $site_path . '/settings.overridemeplease.php';"
+      not_contains: ~
+
+- configuration:
+    drupal:
+      settings:
+        settings:
+          file_scan_ignore_directories:
+            - "${drupal.root}"
+      site:
+        sites_subdir: "inea"
+        settings_override_file: "settings.overridemeplease.php"
+  expected:
+    - file: "build/sites/inea/settings.overridemeplease.php"
+      contains: "$settings[\"file_scan_ignore_directories\"] = array(0 => 'build');"
+      not_contains: ~
+    - file: "build/sites/inea/settings.php"
+      contains: "include $app_root . '/' . $site_path . '/settings.overridemeplease.php';"
+      not_contains: ~
diff --git a/tests/fixtures/simulation.yml b/tests/fixtures/simulation.yml
index e8651cbe..2620451e 100644
--- a/tests/fixtures/simulation.yml
+++ b/tests/fixtures/simulation.yml
@@ -256,13 +256,13 @@
   configuration: []
   composer: ''
   contains:
-    - "AppendConfiguration('build/sites/default/default.settings.php'"
+    - "WriteConfiguration('build/sites/default/settings.override.php'"
 
 - command: 'drupal:settings-setup --root=web'
   configuration: []
   composer: ''
   contains:
-    - "AppendConfiguration('web/sites/default/default.settings.php'"
+    - "WriteConfiguration('web/sites/default/settings.override.php'"
 
 - command: 'drupal:site-setup'
   configuration: