I have absolutely no practical advice for you, but while you’re waiting for more helpful responses, I do have a couple of questions. It’s been well over a decade (probably pushing two) aince ive even ripped a disc or had a movie jukebox type of setup.
First, I think I remember MST3K being identified as the movie they were doing, plus (maybe) a note that it was the MST3K version. It didn’t cause confusion because it’s not like I had an actual version of Pod People or Manos. But, at least back then, there were a few different databases we could hit up for metadata. I still ended up editing a lot by hand, but here were options.
But more importantly, are you talking about extras from the Joel and Mike seasons, or from some more recent iterations? I kind of didn’t pick it up after they got cancelled (and I didn’t like some of the cast changes), so I don’t know if any of the new stuff holds up. I did go see a live production with Joel at some point in the last few years and it was pretty good, but mostly because of nostalgia.