Woah. I was on version 1.3 and just upgraded. Just woah. Entirely more useful, more information feedback, absolutely fantastic. What you need next is to be able to edit in the right side window directly, in a similar manner to FO3Edit. A sorting of records would be useful, too.
On another note, maybe add some debug text so if it encounters something odd, it loads it straight into hex only, or doesn't freak out over empty placeholder subrecords (you might have done these, I haven't checked the full change log). I'm thinking in the future, for Fallout 4, or TES6, it could be useful to have some catching so it's not so buggy. It assumes it'd have some similar record structures, so it depends on how much time it'd take.. but it could be a useful thing in the long-term.
Anyways, this is great work and I'm quite impressed.