I generally remux my MKV files using MKVToolnix and within MKV Toolnix add a track name, i.e. commentary vs DTS Audio Track. Some discs also have separate subtitles for the commentary. Of course within the PMS Server, or the Roku app, when you try to select a different audio or subtitle track, it just displays the format of the track (DTS vs AAC or PGS vs VOB), but it does not display a track name. Would be very beneficial to be able to display this track info or track name for selection purposes.