Something that's always bothered me about ARMA is how everyone *always* has his weapon up. From videos I've seen, people often lower their weapon when not firing.
I guess this request is really twofold - one to increase the speed of lowering and raising your weapon (currently it's quite slow).
The second (and probably controversial one) - is to add a difficulty option which makes the unit slowly lose aiming stability while the weapon is raised.
Correct me if I'm wrong, but guns are heavy, and I lost stability after aiming unsupported after five minutes or so.