Did you miss the part about calibre's ebook editor not being an epub-only editor? I'm assuming you must have... otherwise you wouldn't be claiming that the ability to mark an image as a cover is "useless in real life." It's only useless in your little corner of "real life."
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2. there is no "remove", "uncheck", "un-cover" etc function once activated.
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Separate and unrelated to the discussion. But have you ever considered submitting a feature request for this? You might be surprised what happens.