I'd rather have an ability to choose about all the options, and if there's enough space in the discs, they could give us a choice between Japanese and English voices. So when you go to the Options/Config menu, you could choose:

Voices: English - Japanese - off
Subtitles: English - Japanese - (possibly some other languages) - off
The game language: English - Japanese - (possibly some other languages) - off

I think that would be really nice, and it could be possible. To name a random example, Toonstruck let you toggle voices on and off, and you could also toggle subtitles on and off. I always had them both enabled.