Bisjac I like that idea and I'll be sure to get that addon. Right now currently I just had an idea for one but this would probably end up in tumble madness.
You would set up invisible boundaries on the top and sides of the rollercoaster's track, so the player is stuck there until it's over. and then when the player gets on, they get skis. they click on the skis and use it with the track to do drops loop de loop etc. if anyone wants to work on this tomorrow w/ me, add me on rtb ID 14944