ken

seems, you have a quite generous interpretation of the sterile cockpit rule

I first used a thumb grip on my X-E2 as well, but I never really trusted it. So I exchanged it with a massive (and relatively cheap, about 25$) Mengs handgrip. Now I feel comfortable and safe. It looks ugly and totally ruins the fine retro look of the camera, but, heck, I bought the camera despite its design anyway.