Aw. Hmm... It might...maybe...possibly... work ... similar to Neverwinter (mmorpg). There's an editor in that game. You can change terrain, make quests, set npc behavior, waypoints and so on and on... So... Is it possible to make in EC? I would go with a guess "Yes". Is it worth the money, time, people and trouble? No. Not at this point at least... Maybe a year or 2 after launch, if devs have a possibility to add an editor to the game. Players would be able to add PvE content only (and only through reusing already existing models in game... because if you are going to push something of your own, you'll have to go and talk with GW first). And that content must not affect battle between factions or give any cool / special loot to players, because it would kill the game. Right now, I there's no room for all that.