Choose any station construction tool will light up the coverage area, which includes the station in the middle ...
This appears only to be the case when you have the station coverage active?
It "lights up" in yellow when it is selected in the schedule, although it is still just the one tile in the schedule.
What I mean is if you want to add a new station to the schedule:
Whatever station is under your mouse at the moment, lights up.
This is a well hidden bus stop (especially if zoomed out, you won't find it that easy).
If your mouse hovers over it, the colour changes into something bright (i used red because this was already ingame).
This way you will immediately see you are on a station-tile.
This would speed up the process of creating new lines a lot.
When looking at the schedules, the information I need is where exactly the vehicle will go to and stop. Primarily which platform or loading bay, but even where within a platform the waypoint is can be crucial information at times (remove the platform at this tile, or block access to it, and you've got trouble).
I tought the same actually, it might indeed be better to keep just one tile lit up.
Or maybe light up the other tiles in a lighter colour?