Two questions:
1. Is there any way to force libprs500 to generate metadata from the filename first (or exclusively) even if the file has metadata within it?
2. This is more of a feature request as I doubt there currently is a way to do this:
Some books in my collection I have saved in the form of <author> - <series> - <series_index> - <title> and those without series are <author> - <title>. Perhaps you could add to the metadata from filename section something that allows for two filename schemes (tries to match the first and then the second)