Just gonna put my two sense here. There's only so much one person can do with reporting to the GM's. Blacklisting SHOULD remove someone from your client side view. If other games can do it, I don't see how much coding it can take to make someone just "disappear" off your screen. Even Mabinogi (A freakin old MMO) makes someone completely vanish from your screen, once your BL them. It shouldn't be that hard to expand on the block feature.