A rotator that:
1. Rotates infinitely as long as input is given
2. Speed is dependant on the input intensity
3. Will stop moving when input is cut, like wheels, instead of rotating backwards like an infinite rotator would
4. Have options to stop/coast when input is cut
5. Also have options to be affected by brake
So we could build complex machines like mech legs that work better or working with wheels, move heavy vehicles like tanks realistically