The answer to your questions are YES, NO, NO, NO. I would try getting a surgery from a layman before trying to take some serious pics in India. Too much of beaurocretic BS
and risks. Check out the thread by Charles Falk. He is the only brave soul to venture at Indian airports. Again its not worth the risk. Best is to keep camera LOCKED & tucked away in hand bag and try not to do any stunts. There is a reason why you do not see so many pics on a.net from India.
: As far as I know, they allow "tourist" photography INSIDE terminal only. Again most terminal have NO or Dark windows... and the moment you point camera outside... you get cops all over you.