Our engine supports both custom rigs and biped rig exporting, but personally, I really don't like the biped. Every time I try to animate with it I just end up really annoyed. I never have been able to get used to it's quirkiness. For several years I just made a new custom rig for each character, but that was a lot of work.…
We're not a game developer per se, more like middleware, but we support both Biped and Bones setups. We can use IK, scripted controllers, etc. on our bones, all of which gets stripped down automatically at export time into standard FK. Some realtime IK in the works for sticky feet, etc. But it's nice to be able to use the…