In my opinion Labeltag is a nice feature, but a hack. It adds a second session that doesn't contain any actual data content, but references the first session. This confuses "burn" quality measuring software like Nero Disc Speed. Anyway, it adds unnecessary complexity to the task of simply burning an "image" in a Lightscribe-like fashion. (btw, didn't Labelflash allow you to write on the data side, too? I never tried it.)
This is how a Labeltagged disc looks: