Okay because you have trouble reading. You're question was and I quote "is there any chance to have the ABILITIES editor in the menu ?" why the extra space between the menu and the ? is beyond me but that's how you had it.
I told you to read the 5 posts above yours, you claim to have done so, so I shall point out for you.
Since it was dictated that s/he wasn't going to work on it anymore, that does answer your question as thaty would be something that would have to be added. Can't add something if you don't work on it anymore.
Yes the unknowns are the DLC items, not all of them have been added either, so if you delete them all from your save and 'add all' you may not get your DLC outfit back.
Also as for the second part, it doesn't require his permission to create a video telling people how to use it. I've never even seen someone ask that question, so yeah that was new for me, you get a cookie.
Many of them have been figured out there are I believe, 2 tuts in the forums, you can search through the pages they have been linked to as they started in this thread. But I can't be sure what pages anymore, so just check the tuts part of the forums you should find them.
This editor, I believe, like many others, do a very simple thing. When they mod things, the checks the system goes through is changed to fit them, one can't just undo a game breaking problem with a save that was changed into a game breaker. Usually anyways, sometimes it is possible. From all that I've read, and my own experimenting, you're just railed, you'll have to start a new save, it is what it is. First thing you do unequip everything from the start, save, give yourself all but a single area full of ethers then just chronostatis every time it stops, I was able to get like 60% of all of the missions done in day one from that, but my save broke thanks to doing it >.> <.< though I also never unequiped anything in that save so that's probably what broke it but anyways, yeah you'll need to just restart it and don't do whatever you did to fuck it up, do simple small mods and ALWAYS ALWAYS keep a fucking backup, that's Rule 1.