Twists can get ya into trouble on a quad, its not like a bike in some situations.
On a quad if you tag a rock/stump or something with one wheel you're now at full throttle if it turns the bars sharp enough. It doesn't matter how good your reflexes are you will not be able to get off the throttle fast enough. I've personally seen it many, many times. Search youtube and look at the pros that mess up from time to time with a twist throttle on a quad. But if you're riding in an open area where there's no technical riding like dunes it'll be fine.
Yes they can, but it's less likely since you will normally come off the bike if you hit something or you just lay it down. You can tag something on a quad and you are still on the ground, usually upright. You can't lay a quad down. But it's what you're used to and the type of riding you do. Technical, rocky, tight trails I would never even consider a twist. I've been road racing motorcycles, trail/MX riding dirt bikes, and quads since I was 19 and I'm 34 now.So the bars can't get jerked out of your hands on a bike? I dunno, I had a twist throttle on one of my quads for many years, and never had any problems...didn't see any difference from a thumb throttle.
Dual setup sounds like a good idea if you can design it.
Yes, they do. Alba makes one!some one already makes one its the terry cable duel gasser