More control over troops in battle.
It would increase available strategizing if you could direct your troops after you have dropped them into battle. Nothing is more frustrating to me about this game than when my troops decide to split up and die alone. Even like a military personality option where you could decide how your troops behave in battle such as moving as one cohesive unit rather than acting entirely as individuals, or directing what they attack first. What's the point of being a colander when all you decide is where your troops start?