I feel that there are other ways to reward the player some experience for not fighting. Maybe tie it to the stronghold or something similar. For instance, If you talked your way out of a situation you might get something like " followers at your stronghold heard word of your deeds and their moral boost rewards you ##xp". Whatever the same xp is you would get for all the creatures you would have fought. If you end up changing your mind then have their moral backtrack or something.
Maybe if you could pick to have good, evil, or neutral followers and get rewarded for playing as such. Neutral could be like playing the regular IE games.