Im guessing there's alot of interesting things that can be done with firefight, The coolest thibgs I know of are unlimited ammo clip, affecting enemy eyesight and custom skulls. What other awesome customisations have you seen and what so you think we can do with the custom skulls?
I'd bet you're right, but here's just one thread that has had a similar purpose. I know I've seen more, but I don't feeling like digging immensely. Search First.