This need for a solution to this improvement of my usage of Mp3tag sprung first here: [X] Audacity file load bug
And the solution given was this:
And so an action like
Foramt value "_FILENAME": C:\TheNewFolder\\%_FILENAME%
works as it should
But still, could this be done somehow with Tools? So I could simply push CTRL + a digit? And by doing that also making it disappear from the list of loaded files?