That would probably be a feature request for PG, I’m not sure about it.
If you’re on Mac, I found a pretty nice metadata tagging tool to double check and augment what WaveLab does:
Meta – Music Tag Editor for Mac
Meta is a powerful music tag editor that helps you keep your music library in shape. Edit Album Artwork, Rename Files, Strip Tags, Find & Replace Tags, Edit Typecase, Batch edit mutiple files at once and more…