I can't really get too bothered about never getting the SNES CD add-on either, having experienced a lot of unique games on the PS1 that Sony turned it into. That, and knowing that the
MSU-1 is an option for BSNES/Higan and physical SNESes with flash cartridges. If people really want an expanded Secret of Mana with CD-quality music, someone needs to take the music tracks from Kikuta's Mana-based albums and hack in new areas for an MSU-1 version, since the iOS port pretty well shows that polished sprite work notwithstanding, S-E is satisfied with the game as-is.
Edit: Speaking of Hiroki Kikuta's Mana albums, did you guys know that last year Kikuta (he being the original SOM/SD3 composer, mind you) and S-E released an album last year called "Secret of Mana Genesis" that is basically a remade version of the Secret of Mana soundtrack with high-quality sequenced instruments and synths that is very much in the spirit of the original?
http://www.destructoid.com/secret-of-mana-genesis-with-composer-hiroki-kikuta-236262.phtml
http://www.square-enix.co.jp/music/sem/page/seiken2_somg/
http://www.youtube.com/watch?v=g54I_1RMXJU
http://www.youtube.com/watch?v=Czj0QzbQ564
https://itunes.apple.com/us/album/secret-mana-genesis-arrange/id548354190
I feel like that should probably be somewhere in the original post. (And here's to hoping that the remade soundtrack winds up in a future port?)