And since some of the weapons have scopes, will those zoom in automatically when you 'scope in'?
If there's a modified playertype, consider using the jet button to hold your breath ;) That's something they train you to do in any shooting-related environment to better your aim. Focus is good yeah, same with not moving, getting on your belly is the best way to shoot accurately, but when it comes to your shot grouping, holding your breath and slowly letting it out as you shoot is a win-win.
but that would only work if you made a playertype, and I wouldn't wanna see this delayed too far just for a playertype.