My dream custom content would be raid mobs in every zone. Would be fun to go after King Ak'Anon and some elite gnome automatons or Leviathan in Lake Rathe. The two Sphinx in Rathe Mountains would make fun raid mobs, or at least make them quest npcs. A level 70 brownie that wreaks havoc in Lesser Faydark would be classically evil. Hill Giant raid mobs in the Karanas would be fun. Turn Jo Jo on Kerra Island into a raid mob.
Or maybe not necessarily raid mobs, but every zone would be better with a boss mob that drops some kind of worthwhile loot or quest pieces, just to make use of all of the content that gets ignored.
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