While the idea has it's appeal, it's something that needs to be thought of from the begining... It's not something that can be brought up after 9 years.
From the few pictures I've seen here and there. Making a quest in DDO is handcrafted ( and I really mean handcrafted )... By comparison, making a quest in NWN ( the first one ) and creating all the artwork required for said quest to be put in a specific hackpak seems to be easier. If you've ever played with the Aurora Toolset you know how long and tedious it can be ( especially if you added your own artwork ).
The game is too old for that kind of update.