@phred & @Boroda: sorry, yes, I misinterpreted this part (adding it as a column)... very clear indeed... and easy to go through the files that don't have lyrics yet... Thanks!
@Bee-liever: yes, this might be even more useful... (and avoids the 'problem' of seeing 'Lyrics' in the track information when you have 'has no lyrics' checked)
Also: thanks!