Here's a little update!
The "Special Abilities" module is all done:

And the "Professions" module has been expanded to give control over casting abilities of each class:

Amazing to see that after all those years that dream is coming out!
I'll try my best not to disappoint, but can't guarantee

It's already looking quite complex, and that's by design since I want it to be able to edit every possible aspect of the game.
Maybe I will have to do a series of tutorials on how to use the editor once it's ready.