mmoitem drop data controller

Would you be able to make a way to control the drops for the mmoitems? For example - mmoitems{type=SWORD;id=CUTLASS} 1 1 would drop the item with the id CUTLESS. But - mmoitems{type=SWORD;id=CUTLASS;level=15-20;tier=RARE} 1 1 would drop a Rare item that is level 15-20. This would help a lot with customizing the drops that the individual monsters would have.