Ah, the Virtuix Omni. Very interesting in combination with the Oculus Rift.
Nice thing with the Omni is, it supports every game out of the box. You could of course support it explicitly as a controller and tune the experience (for example by matching steps in the game to the steps of the Omni-user, but it can be configured to just trigger key-presses.
So I don't think the gains are worth the extra effort of explicitly supporting it.