I have BVH animation files that contain side-to-side motion in the forearms, which is technically humanly impossible since that kind of motion really comes from the twist of the shoulder/upper arm (the BVH file does have some shoulder twist.)

I can restrict the side-to-side movement with Limits, but what that really does is just cut off the movement without compensating for it in the shoulder.

So my question is: is there a way to "redirect" the side-to-side motion of the forearms into the Twist of the shoulder, that is, to add the movement to the Shoulder Twist--amplify it, really, since it wouldn't do to simply replace the Shoulder Twist movement since there is some twisting present in this case?

Thanks--Tim