The headunit only displays track numbers up to 99, but it does continue to play if you have more than 99 tracks in a playlist, the track numbering starts at 1 again (i think)..... don't think the track numbering is much use anyway.
As for lifeshine, it always has a nice shine (if it's clean), and it seems to prevent the bird crap damaging the paint. Was hoping it would make it easier to wash the squashed flies off, but don't find that it's much help.... you think it's clean and once you dry it off there are shadows, but they do polish off fairly easily.