DUDE. JUST FLY HIM OUT OF THERE AT SUPER SPEED. I would have liked to see Zod even more out of control. To the point where you really feel he had no other choice.
The actual act of killing Zod has precedent in the comics. I hope movie Supes goes crazy, develops multiple personality disorder, and exiles himself into space like he did in the comics after the deed.
Ok. Maybe not the multiple personality deal. I would be up for seeing him do some "soul searching" in space, leading perhaps to either a confrontation with Mongul and Warworld or Brainiac and Brainiac's Head Ship.