A B737 CAPT EXCEEDS 300 KTS UNDER 10000 FT AGAINST THE WISHES OF HIS FO E OF SAN; CA.

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CAPT'S LEG; ON DSCNT; AT APPROX 12000 FT; I ADVISED CAPT THAT I WAS GOING TO CALL COMPANY FOR GATE ASSIGNMENT. I WAS STILL MONITORING ATC AND HEARD CAPT ADVISE APCH CTL 'ARPT IN SIGHT.' WE WERE THEN CLRED FOR VISUAL APCH. CAPT REQUESTED 'WE WOULD LIKE TO KEEP OUR SPD UP.' APCH REPLIED; 'YOU'RE #1; SPD YOUR DISCRETION.' BY THIS TIME WE WERE JUST PASSING THROUGH 10000 FT AND I ADVISED CAPT OF OUR HIGH SPD (328 KTS) BELOW 10000 FT. HE REPLIED THAT CTLR HAD GIVEN US 'SPD OUR DISCRETION.' I INFORMED HIM THAT CTLR CANNOT LEGALLY WAIVE SPDS BELOW 10000 FT EXCEPT IN HOUSTON; TX; CLASS B AIRSPACE OR IN EMER. BY THIS TIME WE WERE AT 7000 FT AND 320 KTS. AT THIS POINT I TOLD CAPT 'I AM EXTREMELY UNCOMFORTABLE ABOUT THIS SIT; WE NEED TO SLOW IMMEDIATELY AND RESEARCH AND DISCUSS THIS ON THE GND.' HE THEN SLOWED; BUT THEN WE WERE VERY HIGH FOR APCH AND HAD TO MAINTAIN A VERY HIGH SINK RATE TO LAND WITHIN THE LAST PART OF THE TOUCHDOWN ZONE. AT 200 FT AGL I RECOMMENDED A GAR DUE TO HIGH SINK RATE; SPD AND THE OBVIOUS FACT THAT IT WOULD BE A LONG LNDG AND GPWS WARNINGS. WE LANDED APPROX 3000 FT DOWN THE RWY. ALTHOUGH I TRIED TO IMPLEMENT EFFECTIVE CRM; I SHOULD HAVE BEEN EVEN MORE AGGRESSIVE ABOUT DEMANDING THE ACFT BE FLOWN WITHIN FAR AND FOM GUIDELINES. AS FO'S; WE ARE ACCUSTOMED TO HAVING THE CAPT MAKE SURE WE ARE WITHIN GUIDELINES.