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The limitation is in the rest of the download system, it basically keeps only one cover per plugin and throws away the rest. The idea is that the plugin is best suited to figuring out which is the best cover and returning it.
Look at the class InternalMetadataCompareKeygen, it is used to sort results in order of relevance. You can implement an alternative algorithm in your plugin if you feel the need.
Then look at the isbndb plugin which further filters returned results based on the title/author query. When doing filtering remember that the user could just specify a single author name or a couple of words from the title.
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