@KevinH: Without the patch, it was blowing up later on somewhere during the opf build, I'd have to check how it behaves if we simply scrap the metadata field
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That said, I *think* setting it to 0 has the intended effect, and we at least don't magically make a field disappear [although, yeah, granted, it'd only pop up in the opf, I think]
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EDIT: If the fields are scrapped, well, they're scrapped, it doesn't blow up either, but, well, we lose them
(no StartOffset anymore, probably not a big deal, but we do lose the cover thumbnail, and the cover image is not flagged as the cover in the OPF).