That's actually super cool. I'd love if for the rest of the game elementals just ignored Shaman and became yellow mobs. Maybe beasts will be yellow mobs for Druids too. Low-level Demons will have a fear and cower effect when they get close to Demon Hunters and Warlocks (demons that are like 5 levels below yours). Undead ignore DKs. That'd be so awesome to see. Turning mobs non-hostile wouldn't break the game, would just save you from being dazed off your mount.