IN ORDER TO PROVIDE A MORE ACCURATE FLOW TIME FOR ATC; TWR REQUESTED FLC TO TURN OFF XPONDER UNTIL AFTER TKOF.

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WE WERE ON A SCHEDULED FLT FROM OAK TO LAX. LAX WAS DOING FLOW CTL AND WE HAD A WHEELS UP TIME OF XX23 LCL. WE WERE CLRED 'ON TO HOLD' FOR RWY 29 WITH ANOTHER ACFT ON WHAT I GUESS TO BE ABOUT A 4 NM FINAL. THE TIME WAS XX20. NEXT THE TWR CTLR ASKED US IF WE WOULD TURN OFF OUR XPONDER DURING TKOF AND THEN SWITCH IT BACK ON AS WE WERE HANDED OFF TO DEP CTL. THE REASON FOR THIS; AS THE CTLR EXPLAINED TO US; WAS THAT THE XPONDER IS WHAT TRIGGERS THE FLOW CTL TIME INTO LAX AND SINCE WE WERE A COUPLE MINS EARLY; IT WOULD MAKE IT CLOSER TO ON TIME IF WE WAITED UNTIL HE HANDED US OFF TO DEP. WITH AN ACFT ON SHORT FINAL AND THE FACT THAT WE WERE ALREADY LATE DUE TO OUR ACFT GETTING INTO THE GATE LATE IT SOUNDED LIKE A GREAT IDEA TO US. WE TURNED OFF OUR XPONDER; TOOK OFF; TURNED ON THE XPONDER AS WE WERE HANDED OFF TO DEP; AND CONTINUED ON TO LAX. AT THE TIME; IT SOUNDED LIKE A GREAT IDEA; BUT LOOKING BACK; I'M NOT SURE IT WAS THE SMARTEST THING TO DO. HAD WE SAID NO; THE CTLR WOULD HAVE HAD TWO OPTIONS: SEND THE ACFT AROUND THAT WAS ON SHORT FINAL OR LET US TKOF ANYWAYS WITH AN EARLY WHEELS UP TIME. I REALIZE THE CTLR WAS ONLY TRYING TO HELP US OUT AND KEEP ACFT FLOWING AS QUICK AS POSSIBLE; BUT THERE MAY HAVE BEEN A BETTER WAY TO DO IT.