Someone should start a Kickstarter for a professionally done documentary of Terry Davis and TempleOS. He's such an interesting person. I'd watch it. It would probably be an amazing documentary if done well and assuming Terry Davis would be OK with it.
There's a guy known as Ulillillia who has a somewhat similar long term obsessive project (a game, Platform Masters). There was a documentary shot about him that unfortunately seemed to go off the rails in post-production and wasn't released.
Probably not quite what you're looking for (I'd like to know more about the documentary, too), but here's a 1h49m Youtube video of the author giving an overview of Platform Masters: https://www.youtube.com/watch?v=rzjW0xsW7_A
Schizophrenia is an organic disorder, not a neurosis; aside from that, given the pretty plain fact that Mr. Davis isn't equipped to make his own way in the world, presumably whoever looks after him would intervene to prevent a documentarist's efforts from flustering him too badly.
Yeah, it's not every day you see someone with the persistence to roll their own OS like that, and really he has a lot of neat ideas there; guy seems like quite a character, I'm sure there's probably something for all of us to take away, and I'd sure watch it too. It would be really interesting to see the world, for a moment, through his eyes.
