Oh, and another nice feature would be the ability to "hide" or "dim" bones/joints/muscles. So when editing a complex creature, we can click on "onion skin" or something, and then click those things we want to make less visible, and they'd be dimmed out. While dimmed, they wouldn't be collidable (ie: you wouldn't be able to attach muscles to them). For more complex creatures, this could be super helpful!