I have read about players wanting Turbine to allow people to create their own dunegon and submitting for QA, etc. I can see this taking up alot of resources and unfortunately likely not very efficient than just designing in house.
I have a proposal for a way to allow Turbine use whats already been coded and possibly create random dunegons every time based on the party make up.
There are many rooms that have already been coded, especially the sewer type applications. Typically, Turbine will reuse these rooms and change the lighting effects, shadows, hues and put the party to come in through a different access to make it feel unique. Or change a few minor things for a "different" room.
Why not create a program where upon selecting various options from goals, rooms, traps, level of dungeon, difficulty, length, creature types (undead vs orcs, vs etc) etc, etc that aligns or fits all these coded rooms in a layout. Each room can have up to 3 access points, 4 with the point the party comes from. If you add drop hatches, ladders, its more. If the program can recognize the access points and be able to fit like access points together, why can't a dungeon design be automated?
A party can talk to a NPC, select the options and a random dungeon is generated. Reward and EXP is dealt out based on what was selected. The goals could be varied, but 2 simple ones are "kill X number of mobs or collect X number of items"
It doesn't seem too hard of a programming design and given the greater number of options, each dunegon could be unique every time.
I know alot goes more into this, but its start of an idea that I hope Turbine can run with.