Homyans - write about bodies part, because in GTA 4 You can shoot to middle finger... ;D Serious.
Just do mod change bettwen legs, arms, head and torso?
First version will be enable only for 1 ped [without "jumping" camera bettwen characters, like in Fallout 3] and i don't know how to make interface like in Fallout 3... Just must do more simple menu on the right. And time game scale - can't stop game.
What You think about circle menu on centre of screen and just go around with keys [example A,D]?