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Regarding your cover error, all that means is that the cover image is not being used in the xhtml of the epub. You can add a xhtml page in Sigil displaying the cover image so it is part of the body of the book.
With multiple authors, I've seen them separated by comas "," or the word "and", don't know if that helps you though.
With the TOC I'm thinking you mean the TOC displayed by the reader when you select "Show Table of Contents"? If so I'm not sure that it is possible to have a two line display like you're discribing.
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