Hello darco, welcome to the forums.
I believe you read the EULA correctly.
I'll refer you to this (
http://www.lucasforums.com/showthread.php?s=&threadid=130740) thread where the topic was once discussed.
The upshot of it was that mods made here are tolerated since they are not marketed as expansion packs or sold. Besides the EULA, we have never heard an official word on the matter except insofar that Bioware will not let modding be discussed and Obsidian does. :rolleyes:
No one to my knowledge has been contacted by LucasArts, Bioware, or Obsidian with a cease and desist order. (Let's hope it stays that way.)