Add “We’ll have to part ways now.” option in NPC chat. Sucks to ask them to teach you something, then letting them lead, just to tell them “I gotta go, I wish to be alone. Really. Really really. I JUST WANT YOU TO STOP FOLLOWING ME!”
Also, but this would really hurt… Multiple story houses, with roofs and basements? Say, like those big office buildings? Skyscrapers… Yeehaw! snipes few Z’s from the roof then trips over and splats himself on the pavement 13 floors lower
Hmmmm… Maybe, lockpicks (with their own associated skill) + metal doors which hide some good stuff behind them (something like vaults, but without computer console), or safe (strongbox)? I know, you can hammer through with jacqueshammer :), but those should be built really sturdy, inaccesible by any other means, and containing good things (depending on which building they are in - gunstore: gun mods, cop station: CBM, and so on)