OK, here is a request
A full graphical editor for the world -- something that you could, say, pick a GO (let's say some herb) and use your mouse to go spawning.
For that matter being able to right click on an NPC and choose quest giver -> quest and then right click on the quest taker -> finish. If it is a kill quest, you could right click on the NPC(s) and choose quest -> involve (or some crap)
Add on top of that a GUI for creature editing. Select your NPC and all the stats would have sliders, equipment drop downs and being able to see what the NPC would look like in game.
On, and on, and on -- a full GUI for editing the world.
Basically I am rambling, because while all that would be possible, and is how blizz does it, it would be SO much work that I don't see anyone ever doing it