.. it would be for someone to develop a mod where you can squeeze a turret or a small robot into your backpack.

I absolutely love those things. I especially love it when after you hack a security console the game starts going ...

Ker-ching - Man down, 3000 XP
Ker-ching - Man down, 4000 XP

... and you step out of the room and there are about half a dozen bodies piled up in the corridor. And you stand there thinking...Sweet !

Easily the best feature of game IMO. Loved it in DX1 & 2. Love it now.