I know this was listed, but I think the AI needs to learn when to not use magic- like with lopsided battles where the other side can't use magic.
Player needs this option to- (auto-resolve, no magic) option.
Example: Resoln used 30 mana to kill a couple of bandits when she had a couple of champions as backup. Any more overkill and I would have wondered when Dragon Slaves were implemented (and I wouldn't put it past Derek and Jon to throw that in).