A WDB CREW; DEPARTING SFO; TOOK OFF FROM AN INTXN THEY DIDN'T HAVE THE DATA FOR.

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AFTER PUSHBACK AT SFO; WE OBTAINED CLRNC FROM GND CTL TO TAXI TO RWY 10R. WE ARRIVED AT RWY 10R; WERE IN FIRST POS TO DEPART; BUT THERE REMAINED APPROX 2 MINS FOR THE NECESSARY STABILIZATION TIME ON THE PW4000 ENGS. TWR CLRED US INTO POS AND HOLD ON RWY 10R AND WE ACKNOWLEDGED AND ADVISED ATC OF THE ADDITIONAL TIME WE WOULD REQUIRE PRIOR TO BEING ABLE TO ACCEPT A TKOF CLRNC. TWR'S RESPONSE WAS TO CANCEL CLRNC AND TO TAXI OVER TO RWY 10L VIA TXWY R. ANOTHER ACFT WAS PARKED ON TXWY S FACING SE AND NW OF TXWY R. WE COMPLIED WITH TWR'S INSTRUCTIONS AND UPON ARR AT RWY 10L; WERE INSTRUCTED TO TAXI INTO POS AND HOLD. I ASKED THE FO WHETHER WE WERE 'GOOD TO GO' ON RWY 10L FROM THE INTXN; 2 TIMES. THE REPLY WAS 'WE'RE GOOD ON RWY 10L;' AND 'WE'RE GOOD TO GO.' SUBSEQUENT CLRNC FOR TKOF WAS SOP AND UNEVENTFUL. TXWYS U AND R AT SFO'S S SIDE OF RWY 10L INTERSECT THE RWY VERY CLOSE TO THE SAME POINT. IN FACT; AN ARGUMENT COULD BE MADE THAT IF AN ACFT WAS INSTRUCTED TO TAXI INTO POS AND HOLD ON RWY 10L AT TXWY U AND DID SO; THE LINE-UP DISTANCE WOULD PUT THE ACFT GEOGRAPHICALLY VERY CLOSE AND ADJACENT TO TXWY R. THE POINT; HOWEVER; IS THIS: ONCE AIRBORNE; I WENT BACK AND CHKED FOR MYSELF WHETHER IN FACT ENGINEERING NUMBERS EXISTED FOR AN INTXN DEP FROM TXWY R. I LEARNED THAT THEY DID NOT. THE SAFETY OF THE TKOF WAS NOT IN QUESTION AT THAT POINT. I KNEW THAT PLENTY OF RWY HAD BEEN AVAILABLE (GREATER THAN 10000 FT); TKOF DATA FOR RWY 10L TXWY U WAS AVAILABLE; VFR WX CONDITIONS EXISTED; A RELATIVELY LIGHT ACFT WT; AND PARALLEL RWYS IN VERY CLOSE PROX TO ONE ANOTHER; THE TKOF DATA OF WHICH HAD BEEN JUST THOROUGHLY REVIEWED. WHAT DID TROUBLE ME WAS MY FAILURE TO CONVEY TO THE FO A CLR AND ACCURATE INQUIRY REGARDING THE 'LEGALITY' OF THAT SPECIFIC TKOF FROM RWY 10L AT TXWY R INTXN. NOTHING ON THAT DAY WOULD HAVE SUGGESTED WE WERE IN A RWY OR PERFORMANCE LIMITED SIT OR OTHER UNSAFE CONDITION; AND THEREFORE NO OBVIOUS 'RED FLAGS' WERE WAVING BEFORE MY EYES. I DID EVEN RECOGNIZE AND ACKNOWLEDGE THE NEED TO CHK FOR ENGINEERING NUMBERS FOR A DEP FROM THAT INTXN. THE BREAKDOWN OCCURRED IN COM. I HAVE SINCE RECAPPED THE SIT MANY TIMES AND HAVE RECOMMITTED MYSELF TO CLRER AND MORE ACCURATE COM SKILLS IN THE COCKPIT. THANKFULLY THIS WAS NOT A SIGNIFICANT EVENT. IT WAS; HOWEVER; A SIGNIFICANT AND VALUABLE LEARNING OPPORTUNITY.