Regarding pax moving about affecting the trim; my first commercial flying job was on the Shorts 360; the "Shed". No autopilot, hand flown all the time. One could feel the change in pitch as our cabin crew walked from the galley at the back to the cockpit - requiring slight extra back pressure on the yoke to stay level. If I was flying I could say to the Captain, "Our coffee is coming". "Eh?" they would say, before the cockpit door slid open and our hostie would be there; " hello boys, here's your coffee".