B767 CREW BLOCKED AT THE GATE. UNITED STATES CUSTOMS OFFICIALS DIRECTED THE ACFT DOORS REMAIN CLOSED LEAVING THE PAX NO WAY OUT OF THE ACFT IF AN EMER OCCURRED.

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TIMELY OPENING OF ENTRY DOOR. UPON ARR TO THE GATE; I WAS INFORMED THAT THE DOOR WOULD REMAIN CLOSED UNTIL CUSTOMS WERE READY FOR THE PAX. I HAD SEVERAL CONCERNS ABOUT THIS BECAUSE WE HAD NO READY EGRESS FROM THE ACFT BECAUSE THE DOORS WERE UNARMED AND THE FRONT DOOR WAS CLOSED. THE SIT WAS DISCUSSED WITH THE CHIEF PLT OF BOSTON. HE HAD PEOPLE OPEN THE DOOR. MY CONCERNS WERE ADDRESSED AND CONFIRMED; THAT IF THE DOORS WERE STILL ARMED AT THE GATE; THEY WOULD DEPLOY ON TOP OF THE GND EQUIP AND REFUELERS. THERE NEEDS TO BE A COORDINATED EFFORT BTWN CUSTOMS AND THE RAMP TO WARN US IF THERE WILL BE A HOLD; SO THE PAX CAN BE INFORMED; TO AVOID THE RUSH ON THE FRONT DOOR. ALSO; THE AGENTS NEED TO MAKE A PA TO INFORM THEM THAT IT IS A CUSTOMS PROB; AND NOT ACR'S. IT ALSO NEEDS TO BE CLARIFIED THAT THE FLT ATTENDANTS WILL BE PAID HOLDING TIME FROM BRAKES PARKED UNTIL PAX RELEASE. THE JETBRIDGE SHOULD BE THE LAST TO LEAVE THE ACFT PRIOR TO DEP AND THE FIRST TO ARRIVE AFTER THE ACFT ARR WITH THE DOOR OPENED.