Thanks agg karan - so a last minute temp change is left to the pilot - good a hard fixed rule may least to rush and extra stress in the hot seat.
I would expect the same for a last minute taxi/runway change, that result in a time delay/advance would have the same result for the person in the hot seat - Once a plan is submitted, factors can change - but the plan has numerous built in contingencies including all weights of all kinds.
So I expect legally it is up to the pilot to decide if he wants 500kg less fuel or not - but to ride carbon fibre brakes at a higher power setting simply is wrong and due low temps and prolonged use massively increases the wear - and certainly not an official procedure that is approved by any manufacturer - hope this is recorded on the FDR.