Ah, never mind, i found it! I disabled headtracking, and then disabled “override x-box gamepad” (or some such). Now i got back my gamepad right stick, and some of the controls of The Witcher 3, exclusive to the right stick, are finally accessible.
This solves one of my biggest gripes with vorpX: that i couldn’t use my gamepad natively. But i was wrong, obviously.
I hope that someday we’ll get a full documentation, with every single setting properly explained. That would prevent much confusion. :)