It probably won't be a feature of Sigil, but I have a personal output plugin that removes the NCX from an EPUB3. I didn't think it would be of much use to others (since having an NCX in an EPUB3 for backward compatibility with EPUB2 reading systems is still spec-compliant), but I can polish it up a bit and publish it.
Sigil will add the NCX if you ever edit the epub again, so you'd have to remember to save a new copy with the output plugin.
As far as the NAV being in the spine or not ... just create a template epub that includes a "spined" or "spineless" NAV. No need to clutter Sigil's interface with special (and non-vital) options that can be accomplished easily enough with plugins or template epubs.
Last edited by DiapDealer; 03-11-2017 at 11:47 AM.
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