Given the length of this flight, I was happy with the timings. There's a lot of time to kill, especially if you're off to Oz.
What they could do is what AA used to do (still do?) and offer an "express" all on one "tray" option, ie receive your starter, main and dessert all at the same time. This doesn't solve the problem of lights out and a quiet cabin however.
Of course, they could do even better and have a lunch time departure that gets into Sydney in the evening. Much better from a jet lag point of view from my experience.