The forums does not have any ideas? why i see everywhere crappy edits of default stuff?
Sometimes, guns get boring. And when guns get boring, you make a gun that fires a random projectile.
The addon just picks a projectile from a list when firing, it has no relation to events, so i can't help you with that.
I think the model should be a rocket launcher, but neat idea. As another suggestion, how about Those Random Guns Tetrakakimbo?