Something I am not even sure of myself, but I think that when a unit is being suppressed, but has not spotted the shooters, there is no sound effect ofimpacting rounds, making it more difficult to identify incoming fire. It would be helpful to hear the sound of impacts/ close misses.
Throw grenades command - this definitely happens in films at least, and I guess makes sense to do.
Manual reload command/ reload when not in contact for, say, two minutes and have no orders.
More/improved sound Effects, particularly Italian voices in CMFI, there is a lot of echo on them it seems.