ITCZ,
We are talking about the law, and the law is clear.
Having said that, don't worry yourself, no pilot in QF is going to allow any old joe on the flight deck because QF has been clear in their instructions, and that is their perogative. Just becuase QF chooses a certain way does not make it law.
As far as I know
VB interpret the law correctly and therefore they can (or at least could until recently) do it as per the regs.
QF managers, when asked have said the law is the reason, but the truth is they just got it wrong and changing a mistake in QF is like turning a supertanker with a 2hp electric motor.