A menu item that said something like "Finalize" or "Publish" or "Push this button as the VERY LAST thing you do on this ePub" would be fairly obvious. Newbs go through a fairly short/steep learning curve when they first use Sigil anyway. I don't think that kind of a button would be hard to understand.
I'm assuming these ePub3 auto-save functions would only be a factor if you are working in ePub3...these features wouldn't even be looked at if you were still in ePub2. When I finally get around to making the switch to 3, I would like the idea of having the "finalize/publish" button rather than an auto-save feature. There are already several buttons I push in the editing process when finishing the book: spell-check, css-cleanup, Generate TOC, epubcheck...really easy to add/replace one of those with a "finalize ePub3" button.
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