Come on dude Ai armies do not always melee rush your armies-I and many other people on you tube use this mod and they have plenty of musket duels. As to the AI-Creative Assembly never finished the battle AI programing code for this game as the AI programmer quit after SEGA decided to move up the release date. As I see it once a melee starts the AI will throw everything in the mix to give it the advantage. Also the AI will have problems with armies over 40 units as it has path finding problems. Napoleon Total War can handle 40 unit battle better as the path finding is better. I have had many 40 unit battles and if the reinforcement come in they do sometime walk into enemy units. Move your army up before the allied army comes into the fray and the ai will have fire fights with your units. As I said you should play Napoleon for 40 unit battles plus you will have less lag and better frame rates too as the game is better optimized. Now can you change AI behavior? No. It is as it was written by Creative Assembly-but you can change things on how well the unit fights and when it gets tired out and its morale and when it will route. Try the battle on Normal or Easy and see it that helps.