Auto-refresh values possible?

Is there a way to let Mp3tag auto-refresh the values in the currently shown table?

At least every pre-defined time interval (e.g. 3 seconds)?

The only way I can see so far is by pressing manually F5

There is only the manual way.
(I don't want to imagine what happens if you have loaded a collection 200,000 tracks and you get a refresh every 3 seconds where it takes several minutes to read all the tracks ... this would render MP3tag inoperable.)
There is also the key Ctrl-T to re-read the tags of the selected files.