The idea of controlling a lone general/hero is interesting, but to really have a decent affect and to feel like you had some control over the outcome, I'd want my general to have a boost to his stats so he can make a bigger impact whenever he gets stuck in. But obviously not too great a boost that the unit wipes out half the enemy on his own. Heh, imagine playing an entire campaign where you just controlled 'hero' characters on the battlemap! Would be crazy.