As s7en explained, these subs are guaranteed to be off on any other bootleg or official version of ROTS because the video on this version kept skipping and replaying parts twice.
You would have to use a program like Subtitle Workshop (google it) to resync the subs at those particular points. To add to an already authored DVD, you'd have to unpack the VOBs, add the subs, then re-author it.
I use Sonic Scenarist, which, in itself is a very hard program to master. I'm not really up to date on what all else is out there these days. Something like Adobe Encore would suit your needs I think. I'm sure someone else could list a few noob-friendly programs.
I love this thing so much, I made some 100x100 LiveJournal icons for whoever wants to use them. Currently, I'm using the Jedi Council one. There is also one here I didn't make, but I have been using for a while because it's hilarious.
I used to be very active on this forum. I’m not really anymore. Hi everybody. You’re all awesome. Keep up the good work.
Like everyone else, I'm kinda hoping to see a DVD-R of Ep III with Backstroke subs. I sorta wish the Backstroke subs had been the Easter Egg, instead of the sorta-lame gangsta-rapping Yoda.
You ever see the extras for Eurotrip? The director/producers had some clips from the bootleg versions they'd bought someplace. That's what I think DVD extras should be for: stealing the thunder of, and poking fun at, the people who rip you off.
If I had any time, I'd resync the subs up to the official DVD. Then I'd share the sub file so people could add them to their own projects. Hopefully someone else out there has the time and energy to do this.