This feature would allow users to select a point on the track. When a ride vehicle moves past this point on the track, an effect can be triggered. This effect could be a sound effect, a piece of animated scenery could be activated, or other events could be triggered.
For instance, i've done pirates of the caribbean recreation and i could never time the talking jolly roger right. It was always late or early (this is of course in RCT3). I think this would be a big thing when it comes to TPS