Lyricists shouldn't be grouped with less prominent roles like engineers and programmers. I'm in favor of having lyricists included with composers, arrangers, and performers - not hidden away on some other tab. Other websites include lyricists, so why not VGMdb?
It should be for all albums because a lot of albums with one or two vocal tracks don't have the vocal classification. This is most common with soundtracks.
Edit: Would changing spacing and cover resolution be an option so that an extra row could be added without the general appearance being noticeably different?
Like this, for example:
Original vs
Mockup