So i sent this idea first in-game but thought i'd send it here also. An RDM uses both a sword and an ether crystal as a weapon. So my thought was, why can't the crystal be placed in the shield slot so you could mix and match the sword and crystal?
Currently the Paladins are about the only class that uses the shield slot, its just an empty slot for everyone else. This would add another class that would use that slot and give us more ways to customize our RDM.
While the sword would have the intelligence and damage stats the crystals would have the magic defense stats and all.