As of now, if you're aiming and hold ALT, you will move your head and sights with it. Though it isn't the most practical thing to do. Most situations, you just want to look around as you're aiming.
This is easily achievable by using TrackIR or pressing the Numpad keys, but not very practical nor cheap.
In short, my request is that once I press ALT while aiming, I should be able to look around. (Unless using a scoped weapon.)