I think I missed something...
Anyway, thanks guys. The mpeg subtitling might come together soon. Beyond that, who knows?
Actually, I beat Zeroigar on hard yesterday and accessed the Sakuraigar mode. That uses a simple narrated slide-show between each stage instead of mpeg video, so subtitling that would be difficult. We'd have to see if making a sort of auto-subtitling software could work. The system should have the resources for that, but it is still a completely different pain in the ass.
I'll see what Esperknight says.