More detailed bone support

I submitted a model to the factory (https://polyfork.dev/steer/human-hand-with-5-5ee14c) where the purpose is to model a human hand (five fingers) which can be adorned with rings and gizmos. I'm guessing that it's not going to work very well out-of-the box, lol. But it's a good testcase! I know you've got VR experience, that's my goal with this - to make VR hands that you can tinker with. Public!