Weekend Bash
How about you make the outside of the roulette grabbable and the toris next beside those walls.This way both toris would be able to actually interfere with the speed of the roulette just a tiny bit that the outcome should be considered random. if any player makes a move that is

Short reactiontime like 5 seconds for like 3 turns ~50 frames
Could be for betting and would ensure that the current players are actually doing something to make it change speed
Next frame would be like 2000 frames long or until the ball settles