The Map Editor ( on the teams dev list time permitting )
Wall Texture Template ( The game itself has 3+ sets I think ? )
Item Template (1 persons apple is another's pie )
Script Editor ( Lost me here but will be nice to trigger a monster attack )
Sound Effect Template ( changing the gate sound to the swish of the starship
enterprise)
HUD modification ( the teams look is spot on but new scenarios call for new looks )
With the right set of tools you would be able create your own adventures.
Prisoners escaping from a foreboding dungeon (LOG)
Space colony survivors heading home
Hobbits fighting their way through the dark forest ….............you decide
Thinking of the future success of this genre.

If modding is going to be a painless process, lets hope the right tools & tutorials will be in place ?