I recall somebody once suggesting that the parts should consume electricity when moving. I feel very strongly that this should be put in, it just feels like.... cheating when I can apply all this force to things at no cost whatsoever...
I can also report the strange turning problem with things that have winches on them... I have a space station with four winches and it's very hard to dock with it since it starts spinning almost instantly even after reloading a quicksave... '