Sorry I find that Customs officials are like policemen. The nicer you are to them the nicer they are back. You be a prick and they will be a prick 10 times over back. Just chill out and roll with the punches, cos really what difference does an extra bit of time waiting gonna make, and getting all high and mighty and saying that you should be treated differently to everyone else is not going to get you anywhere other than the back of the queue.
By the way, haven't there been some well publicized cases of airline crew trying to take in things they shouldn't have, so as such shouldn't they be put under at least as much scrutiny as the paying punters?