A B767-400 FLT CREW DEVIATED FROM XING RESTR ALT AND EXCEEDED 250 KTS BELOW 10000 FT WHILE TRYING TO ACCOMMODATE SCT REQUEST FOR HIGH SPD ON SEAVU ARR TO LAX.

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LOS ANGELES IS KNOWN FOR HAVING COMPLEX ARR PROCS. WHEN APCH CTL ADDS DRAMATICALLY TO THE COMPLEXITY LATE IN THE GAME; IT MAKES FOR AN IMPOSSIBLE AND MAYBE DANGEROUS SITUATION AS WELL. BECAUSE OF THE COMPLEXITY; I TRY TO PREPARE CAREFULLY; THOROUGHLY; AND EARLY. ON THIS FLT; IT WAS NO DIFFERENT. WE MADE SURE THAT SEAVU ARR WAS LOADED INTO THE FMS PROPERLY; INCLUDING TRANSITIONS; ALTS AND SPDS. WE EVEN LOADED A DIFFERENT APCH INTO RT.2 JUST TO BE AHEAD. THE FMS BOX WAS SET AT .79 MACH/300 KT SPD FOR A NORMAL DSCNT. AFTER SEVERAL STEP DSCNT WE WERE CLRED FOR THE SEAVU ARR AND I PUT 7000 IN THE ALT WINDOW. A FEW MI BEFORE KONZL WE WERE TOLD TO INCREASE SPD TO 320 KTS OR GREATER. JUST AFTER I ENTERED THAT IN THE FMS; THE SPD AUTOMATICALLY CHANGED TO 280 KTS. I REALIZED IT WAS FOR THE KONZL INTXN RESTR. I OVERRODE IT MANUALLY; BUT NOW HAD TO CALCULATE ALL DSCNT RATES MENTALLY; AS IT WOULD NO LONGER FLY RNAV PATH. AFTER THE RESTR AT DIXON INTXN; 12000 FT; I ASKED THE FO TO REQUEST A SLOW TO 250 KTS. ATC REPLIED TO KEEP THE SPD UP AND SLOW AFTER LEAVING 10000 FT. I ASSUMED ATC MEANT TO SLOW AT 10000 FT AND THEN DSND AS IT WOULD BE ILLEGAL THE OTHER WAY. ABOUT THIS TIME; I REALIZED I NEEDED A MAX EFFORT SLOW TO MAKE THE RESTR OF 9700 FT OR BELOW AT TAROC. I ASK FO TO REQUEST IMMEDIATE SLOW DOWN; BUT FREQ WAS BLOCKED. SOON; WHAT I BELIEVE WAS ANOTHER VOICE ON ATC; TOLD US TO SLOW TO 250 KTS. WITH FULL SPD BRAKE; I REALIZED I WOULD NOT MEET THE SPD AND ALT RESTR. I ELECTED TO DSND BELOW 10000 FT AT 280 KTS. WE CROSSED TAROC AT 9800 FT AND 280 KTS. I FELT THE EXTRA SPD WAS NOT AS GREAT A SAFETY RISK AS BEING TOO HIGH ABOVE AN ALT REST. WITH THIS BEHIND US; WE WERE THEN CLRED FOR AN APCH TO RWY 25R BEFORE THE NORMAL TRANSITION AND HAD TO SCRAMBLE TO NOT CROSS ALTS BELOW RESTRS; SINCE LAX HAS MANY RESTRS THAT FLYING A GS WOULD VIOLATE. I RECOMMEND THAT ATC KEEP CHANGES TO COMPLEX ARR PROCS AT A MINIMUM OR ELSE JUST DROP BACK TO OLD FASHIONED VECTORS. I ALSO LEARNED THAT IF I HAVE TO RESORT TO FLYING THE WAY WE DID IN OLD MANUAL AIRPLANES; WE REMEMBER TO USE THE ALT WINDOW AS WE DID; UPDATING AFTER EACH RESTR; SO THAT IT IS EASIER TO BE AWARE OF THE NEXT RESTR. AND FINALLY; LAX COULD SIMPLIFY EVERYTHING BY JUST USING THEIR OLD LONG-RANGE ILS AND GS SYS.