(The two actual questions are underlined - the rest is context

).
I have several epubs converted from various formats over time, mostly with Calibre. I completely missed the "add metadata page" option during conversion (until today) and with an unrooted nook, there's really no way to see a book description for sideloaded books, so I'll sure to add that helpful page to each book from now on.
As for the books I have already, I just re-converted about a dozen epubs (to epub) with a metadata page added. The question is - is there a better way to do this (for ~360 books
)? Reconversion seems like overkill somehow, especially if I have to check them manually (for reasons explained below).
More importantly, I'm worried that when I change that one option (to add a metadata page), I'm overriding the saved conversion option for that book and it may miss chapter detection, TOC conversion, etc. that I had to customize for different books in the past (but that's probably just because I just don't know exactly how that part of the conversion process works - i.e. what settings are saved and how the various possibilities are prioritized). Maybe I'm being needlessly paranoid? So,
question#2: Would an epub to epub conversion leave any existing TOC and other things unharmed if the only thing I change in a bulk conversion job is the "add metadata page" option?
If the reconversion issue above is not something I should worry about, I'll just queue up all the books some night and let it reconvert

. Any help at all will be greatly appreciated. Feel free to suggest any other way of doing this that you can think of. *sigh* maybe it's just time to root my nook and get a proper library browser

- this organizational gymnastics is hurting my lower back

.