As an experience ....

I booked Syd->SFO->DEN->LAX->MEL back in july for late jan 2015 as a W fare was within reason and I knew I was going to need the MR run for next year max layover is sub 4 hours in any place
System let my apply a single GPU online and all legs have now cleared
I should note.... the system lists the flight as a SYD->MEL iten