i think it would be really cool if there were hi tech coaster parts like the track dropping with an elevator like mechanic. also tilt sections like the tilt coaster from rct3. also it would be cool if you could use turntables to turn the car around in some rides and even send them on a different path then it was originally going and stuff.
also stuff like the tower coaster from the rct3 wild expansion pack where the train goes up the tower gets locked in place and the top of the tower rotates and drops the train down a different section of track. and maybe also someting like a gyro table or something. you guys can probably think of a lot of other cool high tech coaster elements too