I am no programmer it has to be said, but here is my thought. Before the magnificent Ride Pack i would have told you that this is not possible. BUT: I had a thought: They managed to have a constantly moving system with the Chairlifts, so maybe they can retrofit the Rapids and the Flumes with that. But having said that, retrofitting existing rides is a loot of work, and they have to justify spending the time on it. Maybe a Dev or Community Manager can chime in here, but the same thought goes about omnimovers (sorry for offtopic). In my Mind they can combine the existing Technoligies to produce the Omnimover, since all the functions for it to work are basically in the Game now.