You may not NEED more metadata. A lot of Indie books used Calibre, and have some of the extras the the basic DC metadata does not include.
Auto... would beat up FREE (metadata source) servers unnecessarily.
You can do a 'batch' from the main GUI.
Select books: Ctrl-D: <choose what>: when it is done you get to choos how to apply. FWIW I prefer to review each and cherry-pick fields
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