I have TMW doors on my RZR but Ive been thinking about rigging up some upper door nets that open/close with the door. Magnum offroad had a pretty cool setup like this at the sand sports show.

I take a lot of newbies/friends for rides when we go camping and Im always nervous about it. Not everyones instinct is to keep body parts inside the car. I catch my wife grabbing the roll cage all the time too. I would feel like crap if I rolled and removed some appendages from my passenger.