Currently MB supports two kinds of "copy tags" command: Copy tags and artwork (Ctrl-C) & Copy tags, artwork, play count, rating.
How about adding a new command that copies all sorts of metadata saved either in the file or in the database?
Then the new command could help users to replace existing files with another format for multiple files that is not currently possible with "Replace files" feature.
So the copied metadata via the command should be complete enough to replace existing files: all file tags and all database metadata including playlists and specific settings under settings tab of tag editor, except RG tags, encoder tag and file properties.