Sorry guys. If you remember a few years ago, there was a big "problem" in the Men's PGA (pro-golf) because a man wasn't physically able to walk the full 18 hole course. The guy called "unfair" because by rule, he wasn't able to ride to the tees in a golf cart. Well, by rule, competitors had to WALK.... when all settled, the rule remained.
Now, all our shooting games are just that.... games. In those designed to simulate "real- life", if you can't walk or run to the next stage, well, you can't. If you're wheelchair bound, you just may be unable to make the moves that an unencumbered shooter may be able to make that might put himself in the best position to survive a shooting.
Just how does any shooting organization make life fair? Maybe the term "handicapped" is the wrong term, but how do you make "even" the disparity between a person in a wheelchair and a person capable of running like the wind? And even if you can, so what. The person capable of climbing fences and shooting accurately versus the person that can't is just life.
So you join the shooting games. Why should the afflicted be given points for not being to do what is required?
Wanna even things up in the game? Add a wheelchair for the able.
Other than that, if you can't do the stage, and you know what's required, accept the points-loss.
Hell, it's just a game.
Real life has it's own requirements for all involved.