Assigning hotkey to Action

Have you look at the ability to assign hotkey to actions such as Crtl+T for Title Mix Case or users can define there own hotkey to each action they create.

see e.g. here:


and/or use the search function to find many more threads about this topic.

Also, see the help on already existing shortcuts:
http://help.mp3tag.de/main_keyboard.html

is already in use to read the tag (again).