I could see ogres being better at wading through water areas--maybe add special break rooms with a timer for moving through.
If simple addins are what you are looking for how about some race specific commands:
Ogres get club bash, gnomes get tinker (make little toys), elves get faerie magic (something silly like that), goblins get something like poison dart (work like a stinger), dwarves get recover (drinking man's friend), orcs get famish (gourger's friends)--they are half pigs--, then give humans nothing because they chose to walk the middle road (maybe a special shop area).
Most of those are genre ripoffs, but it would be interesting to see who would change races for the extras.
