After reading all these posts, I think that we all need to remember that the QF fuel policy sets the MINIMUM legal departure fuel on the ground and the minimum fly on fuel in the air. My reading of the fuel policy reveals nothing forbidding a Cpt from uplifting "sufficient" fuel for the flight in his/her opinion. Indeed, a Cpt is required to uplift that amount of fuel. We are, after all, paid to exercise judgement - tempo SIN in the evenings anyone?
WFK, a principal author of said policy, rarely departed without some extra fuel. use your expertise and judgement.