That is the same conclusion I came to. It baffles me
that the Devs leave so much open then hard code or compile so many resources. It is in a state where we can tweak things but not create new things. Personnally, I was looking to make a Chronicles of Thomas Covenant mod but unless the ability to edit content is there, that won't happen.
This game could be GREAT and see a much longer life if they made it more mod friendly. I know they want to sell expansions and may feel the need to limit the moddability (real word?) of the game but I will buy the expansion anyway (As long as they release the promised Editor, that is) as would anyone who has played this game.