In more than a few mods (particularly judo), it can be quite frustrating to set up a move that saves you from dq'ing and it instantly doesn't work because of a wrsit dismem, so I started thinking up a small idea. Why don't small joints when dismemed (wrists and ankles in particular) only make part of the body relax, such as the arm or leg that joint belongs to. This idea might even be expanded so that the amount of body parts relaxed when a joint is dismemed depends on the joints size. Anyway, just an idea, what do you guys think?

That's way too game changing for my liking. The reason that your joints dismember so easily in judo is because the dismemberment is so low. You can't think to change a major aspect of the game to solve one "problem". I'm sure you'll figure out how to prevent yourself from dismembering in that mod soon enough the more you play it.