If the extension is meant to be used for fun, then one icon is enough. But for day to day epub generation three icons are a-must.
Another thought - would it be possible to fill metadata automatically from file properties - book title, author and description can be present already in file properties, so to fill them one more time by hand is not welcomed.
And continuing our discussion from previous thread - I think you shall let users to decide otf or ttf fonts will be embedded into epub.
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