The treatment of your prisoners could all be handled via a dialogue with your jailer. Graphically I don't see a need to go much beyond that. Leaving it to the imagination seems sufficient.
Like I said above, " hands-off as a blacked-out room..." Its a touchy subject that some people have strong reactions to, and others not-so-much. It all boils down to the predilections of the designers, and the tone they're going for in the game. A text option to the jailer works for me.
Like many others on this board, I'm not interested in playing a one-sided hero. Being able to be a **** is uncommon in games and is something I find that I crave (even if its just the option to go down that road, whether or not I choose it). The KotOR games let you go darkside (but not Really Evil, you're just a jerk who force lightnings people), but in The Last of Us you do Bad Things and make Hard choices. It makes those games feel deep and immersive. I hope that Obsidian isn't afraid to be serious with us in this game. If that's a tone they're willing to go for.
Who knows, the interrogation chamber, adult humor, ****ing, and blood splatter could all be portioned off behind an option to parents to censor the game for their children. Then the game can be marketed to all the children separately from all of us 21-60 year olds who will actually play it.
Another thing I wouldn't mind seeing is the loot that I store in my stronghold getting used by hirelings and companions if its left in storage for a period of time, or is of a lower level than myself. Perhaps the option to put gear in an Armory instead of Storage.