First, thanks for creating mp3tag, i really like it and use it often.
I have however two small request
Is it possible to add support for mp3validator so before renaming atc you can easily validate all mp3's and see which have encoding errors (and have a button to run mp3valdiator to fix them).
I would like an option to remove excess files from directories (so be able to have a white list of files I want to keep and remove the rest, normally the whitelist should contain suported music files like mpt3 and optionally the playlists). That way a batch operation would also make sure to remove sfv, par2 files etc.