Out of curiosity, is the media-type "text/x-oeb1-document" found in a resource record within the MOBI when generating the content.opf file for a MOBI-only (non-KF8) kindlebook, or is it hardcoded in the KindleUnpack code? If the latter, is there a compelling reason for keeping it that way and not updating to an "application/xhtml+xml" media-type? I realize the markup file being produced isn't really xhtml, but "text/x-oeb1-document" is deprecated in the latest 2.x OPF package we appear to be building. Is kindlegen even still accepting these unpacked old-style mobi-markup files as input anymore?
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