One thing I'd like to see is dispatch events.
The Smiler at Alton Towers has possibly the best example of this, when the train is about to dispatch they flash on a set of lights themed around an operating theater as a voice says "Join us", the train leaves the station as a segment of theme Ride's theme plays before an incredibly loud boom ends the sequence.
One of the only videos I could find of the dispatch
The ability to do something similar, either playing a sound clip or changing the station's lighting would be absolutely amazing. If the dev's have been on a field study on some real rides, I seriously hope they've given it a spin...no pun intended.
(Side note: I think this thread technically belongs in Ideas and suggestions)