one thing I missed in Warband was the ability to do some specific actions like to open and close your visor before a battle or to completely get rid of the helmet. Afterall a full helm is not supposed to be worn in melee combat but for horse charging only. A great helm would have been taken off, while a visor would be opened to allow you a better sight.
This would be a great feature to add be it just for the awsomeness to greet someone by opening your visor or say you're ready to fight by closing it. Often in Warband I let my sword sheathed only to take it out right before the action.
Also the ability to yell would be awsome. In warband you can only do it while on your horse.