I too like to use an external tagger but that might just be old habits dying hard.
To answer your q, right click the track -> Edit. Or Shift Enter
Top of the new dialogue box, second tab is tag inspector.
New window across the top will show you options for which formats you can edit. Although the interface isn't suited to do exactly what you wanted (as far as I know).
An another popular alternative is mp3tag. You can set it READ both id3v1 and id3v2.3 but only WRITE ID3v2.3 in the options. So if you select a track, delete all the tags then undo the action, since its only writing to id3v2.3, it will write everything to that format.
I do this in mass to tracks as I go.
It shows you right in the main window if multiple formats are being used for each song you add.