Support full Unicode (UTF-8)
Latin charsets are great for the Americas/Europe/Australia, but what about the rest of the world? Add support for Unicode! Musicbrainz will handle potential collisions (since MBID is used), and many artists there already have romanizations.
It's 2015 outside, and still no UTF-8, no cyrillic, japanese or chinese bands and songs, etc. Only ugly transliteration for years and years. PLEASE add Unicode support!