Sorry if this is

I'm looking for a program like MP3 Tag
http://www.mp3tag.de/en/ which allows bulk changing file names from tags or vice versa.
An app that would do the same for ebooks, even only some formats, would be a godsend to edit ebook metadata in bulk BEFORE importing into Calibre.
I currently use Bulk Rename Utility before importing into Calibre but being able to bulk change the metadata in a group of ebooks before import would be wonderful.
I could then import all my books using metadata which would get the comments and photos for the book covers at the same time and have all the tags the way I wished.
Once imported I could use Calbre's online functions to fill in any holes in the metadata.