I wanted to correct something I said earlier (in relation to recruitment and allow commanders to lead other units in COE2), this feature is already in CoE2. You can make a commander a unit by viewing that commander's stats and pressing "d."
I should read the manual more closely. Have fun playing CoE2 until CoE3 comes out
Oh yeah, one other thing. Instead of the game winning screen saying "You won!" You should offer nuggets of wisdom, easter eggs, story ending depending on statistics or the commander with which you won, or insight about the game (a la nethack fortune cookies).