With some combination of tazers, batons, shackles, chains, rope, etc., being able to capture NPCs.
Having finally settled down in a police station, I found myself wishing I could stock the jail area.
Should be able to capture hostile and non-hostile NPCs, both with a chance to fight back and escape, depending on their STR/DEX.
Hypothetically being able to sell them to slavers in future updates would totally rule.
Implanting control chips, etc.
Simple thought, may be difficult to implement, but it’d be nice to have a reason to use non-lethal weaponry.
edit:
I don’t see myself taking slaves on any of my serious characters, as I usually try to play with my own morals.
That, in fact, is a reason I’d love the option of taking prisoners.
I feel so guilty whenever some doofus with a nailboard tries to rob my power-armored ass, and I have to put them down.
The option to bring them back to my base and keep them locked up until they decide to play nice would be much appreciated.