Sad to see a personal attack in this forum. I do not "just dismiss everybody's request" but I do point out potential problems and drawbacks when I see them. And I will continue to do so.
Hardly a week goes by here without one or more requests for new features. A few make sense but most do not or are already provided by existing Mp3tag features that the poster had overlooked.
In this case, the @Poster solution above shows that Mp3tag shortcut keys can be customized by using a Windows utility. So there is no need to add that capability to Mp3tag itself.