Possible feature: Change route colours on multi-route mode

[ghost]

Could there be a feature that allows manual change of colour for routes when on multi-route mode (either at a bus stop or for a custom selection of routes), such that individual routes can be identified by colour (e.g. 168 in red, 858 in green, 969 in blue)? This would be helpful for screenshots and static images.

Might be technically similar to #47, though the purposes are different. Not urgent and a good-to-have, of course.