I follow a number of captains that like to do faster campaign battle, starting early instead of waiting the full 30 minutes. The problem this causes is for players placing units as sometimes it can take a full minute before the game indicates that the battle has started early and all the player sees is an error placing the unit on an empty spot.
It would be better if captains could set the campaign battle timer to like 15 or 20 minutes instead of 30 to indicate that they are doing faster battles.