Just to update everyone on the status of version 6...

I've been working on resolving some compatibility issues with SUP files generated from BDSup2Sub (discussion here), and that's taken care of now. If you see these compatibility issues yourselves, there's an easy solution for 720p subs and a very painful solution for DVD subs, both described in detail in the discussion link.

I've also been getting a lesson on the vagaries of how different DVD players can do totally different things with the exact same streams, and have concluded that if you're making a DVD project, and you don't control every single DVD player it's going to be played back on, don't bother with matching subs. DVD players in widescreen 16:9 mode seem to do the right thing, but DVD players in 4:3 letterbox mode are not predictable, and they can effectively shift the subtitles out of the frame, making matching subtitles fairly useless, not to mention making all subtitles not CIH-safe (not that someone with a CIH system would use a DVD player in 4:3 letterbox mode, but still...).

Anyway, it's being worked on, and version 6 will be not only closer to universal language support, but also closer to universal playback device support. So we'll have quantity on our side, even if some of the unverified subs are probably lacking in quality.