I am currently working on the next version of Import List which is going to be more flexible with what columns it can import. Ultimately it will include the ability to import into custom columns (for anything - be it clipboard, CSV or scraping from a web page).
However it was never intended as a "metadata update" feature, as it is about creating (or matching) book entries, not updating existing records in the database. So unfortunately I don't see it helping you. I can't think of any way to do what you are suggesting (overwriting data from a CSV file) without writing a bespoke plugin or python script to do it.
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