Again, don't know Down Under rules, but...
The tower can clear you for takeoff from an intersection because that is a known distance from a standing start. The crew is required to have data for the runway from that intersection, otherwise they have to refuse the clearance. At a prior job we carried books of takeoff data for the airports we operated out of. As each runway distance cost X amount per month to maintain the data on, there were many intersections we could not depart from because even though I knew from experience we could takeoff from there, we didn't have the paperwork to back it up.
Landing is a more fluid situation. You are supposed to land in the first 1000-1500 feet but if the approach speed is off or the wind changes the last couple hundrerd feet, stuff happens. My understanding is it's my runway when the tower says "Cleared to land" and I can use as much of it as I want.
If the instructins are to roll to the end and exit right, that might be the one case were the tower can call my exit.