@kovid,
Whilst the subject of metadata update is hot, I would be interested in being able to exclude selected custom column data (some of the ones beginning <meta name="calibre:user_metadata:#...>) from ever updating the opf file, both in "polish" and "send-to-device" etc. The reason being that some custom columns only have meaning in the main library and are no use whatsoever on a device. All they do in the epub opf is make it look bloated and untidy when I'm trying to correct errors.
Something like the Prefs - Look & Feel - Book details would be nice.
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