Read the law people....
It is clear that any person can be on the flight deck, as long as the PIC approves it, and as long as they are there before takeoff.
QF (mis)management say the rules prohibit it, but they say a lot of things. Read it for yourself (some of it has been produced above if you're lazy).
I know first hand that 4 or 5 months ago
VB still used the correct interpretation of the law, as I know a member of the general public who travelled in the jumpseat with his mate who was one of the pilots.
Have they changed? I hope not!