To be fair, I think if Mobi_Unpack were to generate an initial (manifested) XHTML page with the cover image in it, it would be making assumptions about the original source that it couldn't possibly know. The only thing certain that can be ascertained from reading ePub specs is that there is no official way to handle cover images/pages in an ePub. So the bare minimum of properly manifesting the image and adding the <meta name="cover" content="blah"/> tag seems appropriate to me, in this light.
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