Okay, so I'm now at a point where I'm relatively certain I've done everything that isn't locked out by my prior choices. However, there is still potentially a lot that I get the impression I should be able to do even now.
For one, my crew respect is -60. Now, it did take me a while to figure out how to get it beyond -40, but getting it to -60 from there was extremely easy. That said, there's reference to scenes that are only possible with -80 crew respect. I don't have a clue how to get to that point.
While it's obvious that I'm not domming Master X as a sub bottom with negative respect, I was under the impression it's still possible to actually meet him. I never have. I don't know how to do that. I've met Levi, but not Master X. The scenes are now just cycling in a completely anachronistic manner. Is it actually not possible for a sub bottom?
These are the major ones... there's still a fuckton I haven't been able to do, but as far as I can tell, everything else either is locked to high respect/dom/top, requires different important character decisions, or is just not implemented yet.