I can only suggest to the frequent flyers who are frustrated that they complain to the airlines and tell them about it.
MAN management will not listen to or care about pax but they might listen to airlines.
The airlines do frequently complain, not only because late passengers are late to the gate which entails a delay on departure, but also the treatment of Security to operating crews who arrive via the staff security channels. One particular airline is receiving multiple complaints weekly from the operating crews due to the attitude of the Security staff to the operating crew of a particular airline. Sadly, the airport management are so aloof to the issue that very little will change.