Mostly, I'm intrigued by the ability to trap, imprison, or otherwise confine a player without his/her permission.
I think you should see a doctor about that... lol
But in all serious I would love the option to make jail cells. On top of that I would love to be able to restrain players with hand cuffs, or laser cuffs or something
. I would also love some sort of stun weapon so we could knock other players out. And I would like to be able to drag a body when it is knocked out. Think about it, you're on board a huge ship. The rest of your crew doesn't know it, but you're a traitor. So you could do things like follow the engineer down to the belly of the ship and knock him out and drag his body to a hiding spot. That would be hilariously awesome.
Oh yeah, and I've just got to throw this out there. I would love local voice chat in BR. It adds so much in my opinion. Just look at games like APB: Reloaded, and DayZ.
Anyways that's kind of going off on a bunny trail so I'll end it there