+ More runes cause Wanda.
+ An aoe melee combo finisher. Perhaps Moulinet triggers it and modifies the existing melee buttons (save on keybind headaches).
? What if RDM had a dot? Make rotation more interesting? A chore? Meh?
? On the unbalanced benefit thing...what if RDMs got a new cd whose effect changed based on your higher mana type. Doesn't work if in balance.