@Kovid - I note that the configuration screen for an individual metadata source plugin specifically does not include title or authors in the possible configuration list. Is there a particular reason for this? If it was possible to uncheck them there, would that not allow the OP to do what they want - still having Authors being populated on the main checkboxes, but never set from an Amazon source?
@Igladen - Retrieving "all contributors" vs just the author will make negligible difference on performance for the B&N/Goodreads plugins. However it does make a difference to what your metadata looks like which is the only reason why I put the option in there. For myself, I don't care who the "illustrator" was for a book in terms of them now appearing as a coauthor. However I know some people "might" like that, so they can enable it if they want. There will be no performance difference, there are no extra lookups, it just filters out authors from the list it has scraped off the web page.
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