Maybe I am confused, I am sure that was in there somewhere, but I can't find it. If that's the case, one could do MEL-KUL-IST-KUL-SYD-LAX-MEL
Actually I wasn't confused, it's not in the oneworld award section, but it is a T&C for ALL classic awards, including the oneworld award:
14.3.5 A Classic Award Itinerary must contain no more than one departure from the city or country of first departure on that Itinerary.