Wow man, funny this happened to me two years ago when Left 4 Dead came off, there was a command to get rid of the zombies ragdolls as soon as they died, and no limbs came off, yet it was still too gory for my dad to let me get (I eventually got it anyways)
Now they really dont care what I play. I dont think you can turn it off on the 360 just get Left 4 dead on the PC, if you turn it down low it can run on crappy PC's like my second one