If there is a scenario where the old torrent can never be reseeded completely because of a missing .nfo file or because no one is able to rehash 100%, we'll just reupload the torrent.

I know that was a huge issue when DAP created their own tracker for all their MST3K files, and MySpeen members had trouble seeding ISOs with their Video_TS files. In that case I just burnt the TS files to DVD, and then extracted as an ISO. It hashed to about 90% which I felt was better than completely redownloading.

In the case of seeding ISO torrents from a burnt DVD, I think you should be able to use any program like imgburn to extract the ISO. In my experience it should hash.

When seeding Video_TS files, you should just be able to just copy the files from the DVD as long as you didn't reencode when you burnt it.