Here's the gist of what I know so far about the editor (which isn't much):
The editor itself has the main purpose of creating maps and stories. Data on skills, traits and other such stuff is stored in some .obj files that need to be manually loaded into the editor to be usable, and even then I'm not sure if one can fiddle with the files themselves.
Of course, I may be wrong.
Oh my... that is not logical at all.