I was gonna make one for my kids as well once I see what he was tring to do. Heck, we need to sell some of these..
But until he can tell us what it does.
EDIT: I found this, so we know it is the buttons. But it sounds a little like cheating.
with the battle rifle quickly
press r,r,x to fire 2 rounds with out reloading.
press r,r,x,y,y,r,r,x quckly to fire 4 rounds without reloading.
press b,x,b NOT QUICKLY just nowmally near a person to meelee twice at the same time.
press b,x,r fast to meelee then fire at the same time.
press b,x,r,r,x to meelee and then double shot at the same time.
press b,x,r,r,x,y,y,r,r,x to meelee the quadruple shot at the same time