Oh, sorry, I forgot to say, I do already use the ID in the file name used on my mobile device, ie {title} - (authors} ({id}), if that's what you meant. The changing-the-record-but-not-the-epub-file issue occurs in that situation. The old id is retained in the file name after a wireless sync, ie the epub is unchanged. However if I subsequently edit the new book and do another wireless sync the file name is changed to use the new ID so it is all then synced correctly.
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