Given that the OP is travelling on a AONE4 ticket, I am assuming he is booked in business class for the QF domestic sectors. Therefore exit row allocation is unlikely to be attractive since the exit rows are located in the economy sector of most domestic aircraft. I suppose we see the occasional 747 operating domestic flights, but its not very common to have business class seats in exit rows on domestic flights. Of course those domestic sectors of international flights do permit pre-allocation of seats.