When the savings of fuel cost go into the pockets of the operating pilots, then sure exchange ideas.
Don't run the APU either. You can then either freeze or sweat your bollocks off while the management come up with more great initiatives from their air conditioned offices....
Those air conditioned offices have the power on all hours of the day and night. Coward Street in Sydney, Waterside and Cathay Pacific city hum along all day and night. When the administrative staff and executives turn the air conditioning off to save carbon then they can be taken as serious. Until then they continue to stuff pilot savings in their fat pockets.
Pilots carry what they need, do what they consider is safe and that is why the PIC carries strict liability.