A319 FLT CREW ATTEMPTS TO TAXI WITH 'NOSEWHEEL STEERING DISCONNECT' PIN STILL INSTALLED AND DELAYS ON RWY AT DCA.

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OUR FLT INITIALLY PUSHED OFF GATE IN DCA ON TIME; BUT EXPERIENCED A FUEL PUMP FAULT THAT REQUIRED US TO RETURN TO THE GATE FOR MAINT ATTN. ONCE PROB WAS MEL'ED; WE PUSHED OFF SECOND TIME BY SAME PUSHBACK CREW (MAINT AND GND AGENT). HOWEVER; THIS TIME THE AGENT EXPERIENCED EXTREME DIFFICULTY UNHOOKING THE TOWBAR AND AFTER NUMEROUS ATTEMPTS; MAINT INFORMED ME HE WOULD HAVE TO HOP OFF TUG TO HELP HIM. ONCE DISCONNECT WAS FINALLY COMPLETED; BOTH INDIVIDUALS GATE PROPER PUSHBACK/DISCONNECT VERBIAGE AND HAND SIGNALS PRIOR TO A STANDARD WAVE-OFF. WE STARTED BOTH ENGS AND RAN CHKLISTS WHICH IS WHERE WE SHOULD HAVE CAUGHT THE NOSEWHEEL STEERING INDICATION. HOWEVER; OUR ATTN WAS INSTEAD DIVERTED TO THE NEW ECAM STATUS ITEM OF THE FAULTED FUEL PUMP FROM THE MEL WE CARRIED. WE DID THE PROPER BRAKE AND FLT CTL CHKS AND CONTINUED TAXIING APPROX 400 YARDS (ALL STRAIGHT) UNTIL GND CLRED US TO CROSS RWY 15 FOR A RWY 19 DEP. THE FAILURE OF THE ACFT TO BE ABLE TO MAKE THE SLIGHT L ACROSS RWY 15 IMMEDIATELY MADE US REALIZE OUR PROB; SO I IMMEDIATELY STOPPED THE ACFT ON RWY 15. FORTUNATELY; THIS WAS NOT A BUSY TIME FOR DCA AND OUR POS ON RWY 15 DID NOT IMPACT ANY TFC OR CAUSE ANY DELAY FOR OTHER ACFT. WE WAITED APPROX 8-10 MINS FOR MAINT TO BE ESCORTED TO OUR POS; AT WHICH POINT THEY REMOVED THE PIN AND WE CONTINUED OUR TAXI AND SUBSEQUENT TKOF WITHOUT FURTHER INCIDENT. IT IS CLR THAT NUMEROUS FACTORS CAUSED BOTH THE GND CREW AND FLT CREW TO MISS THE FACT THAT THE NOSEWHEEL STEERING PIN HAD NOT BEEN REMOVED. FOR GND CREW; A COMBINATION OF A REPETITIVE TASK; THE UNDERLYING PUSH TO KEEP THE FLT ON TIME FOLLOWING OUR 30 MIN DELAY FOR THE FUEL PUMP MEL; THEN COUPLE THAT WITH THE DIFFICULTIES THEY BOTH EXPERIENCED UNHOOKING TOWBAR CAUSED THEM TO MISS IT. FLT CREW ALSO FAILED TO NOTICE IT AT THE APPROPRIATE SPOT ON CHKLIST WHERE CHKING ECAM STATUS IS REQUIRED BECAUSE FUEL PUMP FAULT REQUIRED US TO DIVERT OUR ATTN TO THE REQUIRED STATUS PAGE FOR REVIEW. NO DOUBT; THE SAME UNDERLYING TIME PRESSURE PLAYED A ROLE; THOUGH SUBCONSCIOUSLY; AS THE PRESSURE OF BEING LATE CANNOT TOTALLY BE DISCOUNTED.