Personally, if it is possible to change the 'power' of the joints, then it's an interesting idea, but like rcarey has said, those of us who rely on the legs for offense and comebacks would lose out. Sure if it was made into a new mod then it would be fine, though I doubt it would be welcomed into the current wushu mods.
Love the idea, and it'd be awesome to see it happen. It'd certainly make us focus on the core body movements instead of jacking a leg underneath or towards someone and letting loose.