GL using the "Greedo shooting first" thing to tame down the movie and get a PG? Well I think he would get a PG for it today. Remove the blood in the arm cutting scene and you got yourself a G movie.
Maybe he could have done like Scorcese did for Casino. He shot a head vise scene in which Joe Pesci crushes this guy's head in a vise, he made it as violent and gory as he could so the rest of the movie would be tamer in comparision and used it as a sacrificial lamb. They would rate the movie NC-17, he would remove that scene (which he didnt mean to include anyway) and they would re-rate as an R. For some reason, they rated the movie R WITH that scene. Scorcese even had to remove some of the more graphical parts of that scene before release (and it's still quite a violent, disturbing scene)...
Maybe GL should have done the vise scene with Owen Lars and some stormtroopers:
"Owen Lars, listen to me. I got your head in a f(BEEP)ing vise. Now tell me where are those droids you bought."
"Arrh... Arhh... F(BEEP)k you! F(BEEP)k you you motherf(BEEP)er!"
"F(BEEP) me? F(BEEP)k me? Take that you motherf(BEEP)er!" *squeezes his head, one of his eyes pop out*
"AARRGGH... f(beep) you! Kill me... Kill me... KILL ME!"
"Kill you? F(BEEP)ing s(BEEP)thead... TK-421, do this guy a favor will you?"