wow from 12 years ago hope things are still moving forward for mp3tag and are still open for new ways of thinking and adding new features
Oh, they are, they are. Just have a look at the changelog:
https://www.mp3tag.de/changelog.html
Yes, 12 years ago someone suggested an action that asks for an input.
So, your idea was not an original or new one.
And perhaps the idea never lead to an implementation because
has to be taken seriously.
The alternatives have already been mentioned in this thread.