In most other bug report systems there is both the possibility to report bugs and enhancement suggestions. Judging from the abbreviations above, I'm not sure if suggestions fit in here (otherwise: where else should I put them?).
I just wanted to recommend that users have the possibility to disable/reassign some keyboard shortcuts in the options.
For example, I must use other applications (with extra features) in my workflow and in two of them CTRL+R reloads the tags (the equivalent to F5 in MP3Tag). Therefore I ended up deleting all my tags a couple of times already. For this and other types of situations it would be great if the user could choose his/her shortcuts in the options (preferably even enter new ones there).