This detects if VelocityMagnitude > 10 [and also checks I'm not in a station, not grounded, etc] and then toggles off tracked IK, plays a lay forward animation, turns on arm to wing constraints, and some other animator nonsense.

[The flight system itself is just OpenFlight VRC. Check it out if you haven't seen it before!]

It's still rather jank and I need to iron out a lot of things. Though I don't think I can clean it up to the point I want to with how VRChat handles IK to Animation toggling.