Stop the AI charging their general when there's under 5 men in his unit (because then he dies in the charge).

Put a limit on how many militia the AI can use in its armies to try to get some real ones emerging.

Get rid of passive campaign AI!!!!!!!! - I just came across the spanish and the portugese in my hre campaign (i've got all of germany, france, poland and most of italy, so i'm a fair way in, probably about 50 or 60 turns) and they haven't done anything. I could take zaragosa and valencia from the rebels. Not good :(