I'm no longer at CP, but when I was a CA there, I'd drop the brake once I heard the FA arm the door. As soon as the box registered an out time, I'd set the brake. It's ridiculous that the airline feels you shouldn't be getting paid in an enclosed tube, with an engine (APU) running and a multitude of issues could arise. Screw that. I did it 100% of the time, even on upgrade OE and never heard a peep.