The Unity animation override system is pretty shit and does not allow for much freedom when creating your own animations.
I would like us to be able to upload our own animation controller for humanoid avatars.
Me (Lather) and Smoothie are having issues with out custom animations due to this and to quote hackspanner:
"Its the Unity animation override system
I think as a fix we could allow you to upload your own animation controller (like for non humans). but then it would have to be an exact copy of the Template with everything filled in. And we can't provide you with any of the animations because they are licensed. For something like a robot without hands its probably okay, but a human character would have to replicate everyone of the crouches and hand gestures. that's a lot of animations to add."
I don't mind making a bunch of my own animations and this would allow us to make some pretty cool complex avatars.