Additional Joints
What I think would be great is if additional joints could be assigned in mods.
In the mod-maker, you can create these additional joints and choose two objects to be linked together, then edit it like how you would any other joint. You can label them with anything you'd like and choose what their states will be called, then assign them to let either Tori or Uke (Or both) control them.
For example, in a mod where the Tori is sitting in a car of sorts, there could be a joint labelled "Engine" or something of that sort, which can be in the states Forward-moving(Extending), Reversing(Contracting), Idling(Held) or Coasting(Relaxed).
Due to the lag it might cause, it could be limited to, say, four joints per mod (Two for each player).
I don't see why this could be too hard to implement, and it could open up a whole world of possibilities for the mod-makers. What do you guys think?