One problem that has been bugging me is how closely units will follow you and how they just blob up on you the second you stop. I tend to like to lead my cavalry on charges but the second I stop or slow down, they all crowd around me boxing me in and preventing me from moving. I would also like to see the units maintain proper spacing so that they actually have room to swing their weapons. Nothing worse than 20 units crowding around a single enemy all getting in each others way preventing any of them from killing him. They should program the AI to spread out a bit and maybe make it so that no more than 3-4 units will actually engage any single unit at a time. I mean it would be nice to have just a bit of room in a siege to actually be able to swing and block properly.