Heya, I dunno' if this would completely screw with the balance of the game, but do you have any intentions of conducting further balancing with items? For example, I would imagine that the brass helmets of the Continental Dragoons would be more effective than, say, a tarleton. Or, say the knee-high jackboots of some cavalry are more protective than ankle boots. That being said, this is really is just grasping at straws, but I was always disappointed by the underwhelming armor values in Napoleonic Wars, cuirasses providing little more protective value, and all helmets being made equal.
Nitpicking over.
Now, a question while I'm here. What exactly are the stat differences between units such as marines, light infantry, foot guard, milita, etc?