Right now we have an option to connect multiple platforms into a single station if they overlap. Would it be possible to add a building as a mod that connects to stations in the same way? Maybe we could mod in a "waiting room" that costs some serious upkeep every day, but increases time that a passenger can wait before being compensated? Or maybe have a parking lot that allows to increase station catchment range by 15% for an extra X of upkeep? Or even just a footbridge that could allow connestion of two platforms that are not "touching" into a single station, like when placing these platforms on two sides of a narrow river? Restrooms to increase comfort and general "happiness levels" of each station and so on and so on.

There is plenty of options that could add a lot more variety to the game and they could be as simple as creating a PNG and a list of properties for each building mod and... done, ready!