Incheon, never had any problems with hand inspections. They've always complied. Average about 4 times a year.
Jeju Island, no problem here with hand inspections either.
Beijing, only once, they allowed a hand inspection but made a big fuss of it. Had to wait a while and they thought my rolleiflex was a rocket launcher (no kidding).
Shanghai, always had to toss it through scanners
Hanoi, Danang and Saigon always required scanning, EVEN when I was carrying 1600 Superia and 3200 Delta. I was not a happy camper...
Phnom Penh, allowed hand inspection but this was 2009. Things may have changed.
Dhaka allowed hand inspections but they seemed mildly annoyed by the extra work required and seemingly only hand checked it because I wasn't going anywhere.
Kolkata, allowed hand inspection but were not happy about it and were considerably confused by the concept of film. Had to wait for 15 minutes for someone to show up and fondle my rolls for a few minutes before letting me pass.
Whew, hope that helps