I've noticed in Commander Battles, the frequent issue of having all of your soldiers facing the wrong way. Whether they're shooting at the wrong line - I've had my whole line shoot at a cavalry regiment on the other side of the map but ignore the enemy infantry 50 meters in front of us - or if they are facing the wrong way while retreating. My suggestion is to add commands that allow you to tell your soldiers to face a different direction, IE- "Face Right", "Face Left", and "About Face" this would allow the player to keep a tighter leash on his soldiers and keep them from screwing up so much.
And going along with this suggestion I would like to recommend the ability to wheel infantry lines. It's usefulness goes without saying really. I'm sure anybody who's played commander battle knows how useful these things could be.