You know what? That's a good idea you got there.
That way, you won't have teammates messing up your aim with the screen shaking while they're shooting through you. Maybe then, you'll be able to clear the Special Infected faster than your teammates can. It's crazy how the teammate shooting through you does the damage on the SI, but not you that's doing most of the blasting on your target. It'd be nice if the screen didn't shake when you're being shot at, and if the aim wasn't being affected by your own teammate.
I'm glad you mentioned the push-back effect when your teammates are walking through you and around you. There's nothing like crossing that small wooden plank in the 2nd chapter of the Passing with the rest of your team, but then you fall off because a fat teammate of yours pushed you off. It's a "neat" little touch by the game developers. If it were to be removed, I would sure as hell "miss" it. After all, it's not like it's an annoying feature or anything like that (Note: It is).
You know what?
You should use laser first.