Good point. I'd say that ideally the punishment for grieving should be harsh. But honestly there is no way to keep grievers at bay. So maybe give a "mega server for RP and another for regular" with the PVP flag being what change your instance.

1 Mega Server for each region (US, EU). Instanced versions of each zone and chat divided in: PVE, RP, PVP, RP-PVP. To determine which instance/chat you go to it would use flags (like the PVP one we have now). There done. Problem solved. Now how to solve the name collisions during merge time that is another question