I always wanted a PvP instance..wherein there are 2 guilds in the instance 12 per guild. Each guild gets a small keep and the objective is to infiltrate and kill the other guild's guild leader.
Before the start of each session the guilds have a chance to pick and place 20 NPC "guards" and traps around the guild keep. The winner of each session will be announced in red across global and the top guild can claim the red skull raid boss nameplate. The top ten "champions" from each guild will also be available publicly including average DPS per session/# of deaths/ # of kills / heals done/ damage taken etc.
Also, titles can be earned through the system including "the Butcher" for most kills on the server. "the Kingslayer" for the most guild leader kills on the server. "the immortal" for most damage taken and least deaths on the server.. etc.