@lazorbeam - the author of this PI is no longer active, so the chances of getting any enhancements are pretty slim.
However you can do some of what you want using your file manager.
In main GUI program (library manager) go to Preferences->Miscellaneous and click the Open configuration directory button, the generate cover PI images are in the ...\resources\images\generate_cover sub-directory.
Close calibre before you add, rename, or delete any images in that folder.
When you restart calibre and run Generate Cover the changes you made will be there.
BR
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