What is the feature or ability you would like to have?
The option to copy tags, from one track to another, or when loading the tag editor with multiple tracks selected, where one of the tracks has tags set already
(Shown in the tag editor by lines around the tag names of the track that already has tags set), a button that directly sets all those tags for the rest of the untagged tracks.
How will this feature help you and others?
Help me tag tracks faster.
Does a workaround currently exist?
Not really, the closest thing is to bind a set of tags to a hotkey. But dynamically being able to copy them would be useful in some situations.