No there's no way a plugin can influence that algorithm. That algorthm exists so that a user with a lot of plugins enabled is not overwhelmed by lots of very similar results. Generally speaking, the metadata download process is not really conducive to allowing a user to pick and choose between slighlty differing individual results as that would be a mess for the most common use cases.
If you really want to allow users to choose individual publishers and the like, your best bet is to to create a user interface plugin that bypasses the normal metadata download process altogether and has its own UI for browsing results. The downside to this approach is that your plugin will not be useable from the edit metadata dialog.
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