I think a cool weapon would be acheived later in the game and would allow you to return various baddies(the organic ones and no big daddies or little sisters)back to their original state before they juiced up on plasmids. So they would look like ordinary humans and then could assist you or turn and flee(depending on how you played the game up to that point). This weapon would not have infinite ammo but instead would use up some of your life or maybe have something to do with your plasmids to fire. The reason for this weapon would be to achieve a "good" ending and maybe have some help during a Big Daddy fight. This again would only confuse the Big Daddies(not return them to anything, the little sisters would run away in fear..possibly towards a Big Daddy).This could be a Godsend or could hurt you alot(lets say you sacrifice some of your health to return the baddies to normal but then run into a Big Daddy...trouble!!).Also the baddies when turned back to normal would have different character models to avoid repetivnes.