FO; PF; IN A B767 ALLOWS A SPD OF 300 KTS WHILE IN DSCNT TO 8000 FT. FO CITES DISTR WITH AN UNRULY PAX IN CABIN THAT INTERFERED WITH THE COCKPIT COORD.

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MOMENTARILY EXCEEDED 250 KIAS BELOW 10000 FT MSL; APPROX 300 KTS AT 8000 FT. THE LAST 30 MINS OR SO LEADING UP TO THE EVENT WERE EVENTFUL DUE TO A DISRUPTIVE PAX. PAX WAS A FOREIGN MALE. UNKNOWN TO US; HE HAD BEEN DENIED BOARDING ON 2 PREVIOUS FLTS TO LGA DUE TO HIS BEHAVIOR WITH ALCOHOL. THIS WAS THE LAST FLT OF THE DAY TO LGA. THE GATE AGENT BOARDED THIS PAX STILL IN A QUESTIONABLE STATE OF SOBRIETY; WITHOUT CONSULTING THE CAPT; AGAINST COMPANY RULES. HE DID HOWEVER; TELL THE FLT ATTENDANTS NOT TO SERVE HIM ALCOHOL. STARTING ABOUT 40 MINS OUT; THE HEAD FLT ATTENDANT WAS IN AND OUT OF THE COCKPIT CONTINUOUSLY ADVISING OF PROBS WITH THIS PAX YELLING AT THE OTHER PAX; SOLICITING ALCOHOL FROM OTHER PAX; NOT SITTING IN HIS SEAT AS ORDERED. FINALLY; CAPT DIRECTED ME TO GO BACK AND GET HIM SEATED (HE WAS IN 1ST CLASS). I FOUND HIM IN THE AFT GALLEY (AT REARMOST PART OF ACFT) BOTHERING 2 FEMALE FLT ATTENDANTS. I ESCORTED HIM TO HIS SEAT AND DIRECTED HIM TO REMAIN SEATED FOR THE REMAINDER OF THE FLT. HE HAD A LEG INJURY (WAS A WHEELCHAIR ON/OFF PAX); ACTED STRANGELY; POSSIBLY INEBRIATED OR ON DRUGS; AND WAS DEFIANT. MINS AFTER I RETURNED TO THE COCKPIT AND WAS TRYING TO SET THE FMS UP FOR THE APCH TO RWY 22 AT LGA; THE FLT ATTENDANT SAID HE WAS UP AGAIN AND CAUSING TROUBLE. I WENT BACK TO THE CABIN AGAIN; HAD HIM SIT DOWN AND FASTENED HIS SEAT BELT; AND ADVISED HIM THAT HE COULD BE ARRESTED FOR SUCH DISRUPTION TO THE FLC. WHILE ON THE STAR TO LGA; I WAS ESSENTIALLY FLYING SOLO AS THE CAPT WAS SPENDING 100% OF HIS TIME WITH COMPANY DISPATCHER; LGA STATION OPS; AND FLT ATTENDANTS -- THEY DECIDED TO HAVE POLICE MEET THE ACFT. I WAS CLRED TO 'CROSS SOMTO AT OR BELOW 13000 FT AND DSND TO 11000 FT; MAINTAIN 310 KTS OR GREATER.' THE FMS VNAV MODE WAS PROGRAMMED AND THE DSCNT STOPPED AT 13000 FT. THE DSCNT MODE WAS THEN CHANGED TO FLT LEVEL CHANGE AND WE WERE NOW CLRED ON DOWN TO 7000 FT. SIMULTANEOUSLY; OUR RWY ASSIGNMENT WAS CHANGED TO RWY 31. WHILE TRYING TO REPROGRAM FMS FOR RWY 31; AND AMID ALL THE COMMOTION AND WITHOUT A COPLT DOING ANY PNF DUTIES; I NOTICED THE SPD WAS STILL ABOUT 300 KIAS WHILE DSNDING TOWARDS 8000 FT. I IMMEDIATELY AND QUICKLY CORRECTED. THE CAPT HAD NO IDEA WHAT WAS GOING ON UNTIL WE WERE ON DOWNWIND.