Changing Per instance variables

After installing the game server. You can go to the folder location. Steam-Server-Manager\<ServerFolder>\Variables-<ServerFolder>.ps1 Right-click and edit with Notepad or your favorite editor, like Notepad++.

Example: Steam-Server-Manager\insserver\Variables-insserver.ps1

Here you will see the variables used by SSM and the Launch Params. Edit Carefully. You can add commands to the launch params. Make sure anything that is added is inside the last quote. Example:

Before
# Server Launch Params
$global:launchParams = @("${executable} ${defaultmap}?Scenario=${scenario}?MaxPlayers=${maxplayers}?Lighting=${lighting} -Port=${port} -QueryPort=${queryport} -log")

After
# Server Launch Params
$global:launchParams = @("${executable} ${defaultmap}?Scenario=${scenario}?MaxPlayers=${maxplayers}?Lighting=${lighting} -Port=${port} -QueryPort=${queryport} -log -Mods ModDownloadTravelTo=TORO?Scenario=Scenario_TORO_Checkpoint_Security?Lighting=Night")