I think people should understand that mod support will always come later after game released.
If say during Beta and people start to asking this and that editor/mod tweak or enhancement, even new tools, they won't do it for sure. Imagine you divert important human resource to do those have no direct impact of the main game itself.
A forum/sub group or wiki is needed and will be filled up when the tools are released( due to above reason, I don't think they will release editor before game release.) And I'm pretty sure if Larian is open about the file format, there are tons of people knows how to deal with authoring packages and/or hack the files, check the scripts, etc.
Let's say, Larian open a sub-group today, what are you gonna put in it then? There is no tools, no files from alpha/beta builds, game/engine mechanism isn't fully transparent yet. What you can do is speculate and run some wild ideas. Which all can be done by opening a new thread here.
My 2 cents.
