Jon, I think you need to think it through
Once an epub is it outside of a calibre library it belongs to 'me'. I don't want metadata.opf files sprinkled all through my file system, it's bad enough that windows sprinkles its desktop.ini files like confetti all over the place, they did at least get rid of thumbs.db.
I run a video player that remembers the last viewed position, the data is stored for the last N videos in Appdata, where N is specified by me. That's works well... until I copy the video to my netbook to watch on the train.
BR
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