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1) No there's no way to know how identify has been called
2) One cover per plugin is the rule.
I can change 1) quite easily, but (2) is rather more work than I'm willing to put in at this point. Still it should be a fairly easy patch if you are motivated enough to do it.
Though I think that even in the case of bulk metadata downloads you wouldn't want to return a match with no cover/poor metadata, so it is worth fetching all the editions and sorting the list. Run each individual fetch in a thread, so then the hit should only be a few seconds.
This is for example what I do with Amazon, even though their search engine returns fairly good relevance rankings.
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