I really hope that a popular VR Social app could allow for arbitrary motion tracking.
I wanna be able to completely remap my motor range to allow granular control over completely dissimmilar morphologies. If I were a spider I wanna be able to, say, "rebind" my fingers to my legs, both in-app and in-wetware. Or get even more subtle with it if consumer tracking tech gets sophisticated enough.
Homuncular Flexibility is an amazing phenomenon and consumer VR has barely scratched the surface of it's potential. We're still too hung up on the assumption that immersion = replicating the player's physical body in VR.