DEPARTING IAH; AN LGT CREW CONTINUED TO TAXI FROM RAMP CTL'S DESIGNATED SPOT WITHOUT CLRNC FROM GND CTL.

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CAPT IS A REAL 'LAID BACK' TYPE -- EASY TO FLY WITH; NOT DEMANDING; BUT SOMETIMES DOES THINGS CONTRARY TO COMPANY SOP; WITH NO OTHER 'APPARENT' REASON; OTHER THAN IT SUITS HIS NEEDS AT THE TIME. THIS WAS THE LAST 'TURN' OF A 4-DAY TRIP; A ROUND-TRIP FROM IAH TO DTW. HE WAS ANXIOUS TO REACH DTW AND RETURN TO IAH ASAP DUE TO PERSONAL REASONS. AT IAH; RAMP CTL INDICATED A 'SPOT' NUMBER TO WHICH TO GO; AT WHICH THE FLT WAS XFERRED TO IAH GND CTL BY CLRNC DELIVERY; WHOM WE CALLED UPON REACHING THE DESIGNATED NUMBERED SPOT. WE COMPLETED THE AFTER START CHKLIST; AND RAMP CTL DIRECTED US TO SPOT. WE WERE TOLD TO CALL CLRNC DELIVERY AT THE SPOT FOR TAXI. I SWITCHED FREQS; ONLY TO DISCOVER A 'FULL RTE' CLRNC BEING GIVEN TO ANOTHER ACFT. AS WE APCHED THE SPOT (WHICH INDICATES THE BEGINNING OF ACFT MOVEMENT AREA -- CLRLY THE PROVINCE OF GND CTL); IT BECAME OBVIOUS THAT THE CAPT HAD NO INTENTION OF STOPPING. I CLRLY AND ASSERTIVELY REMINDED HIM THAT TAXI CLRNC HAD NOT BEEN RECEIVED; BUT HE REPLIED; 'DON'T WORRY ABOUT IT -- I'LL TAKE THE HEAT FOR IT.' FORTUNATELY; NO OTHER ACFT WERE COMING; AND NO CONFLICTS OCCURRED. I HASTILY CALLED CLRNC DELIVERY ON THE NOW CLR FREQ; AND WAS TOLD TO 'MONITOR GND.' GND TOLD US TO 'TAXI TO RWY 26 VIA TXWY NB;' BUT DIDN'T MENTION THE FACT THAT WE WERE ALREADY ON THE TXWY; HDG FOR THE RWY. I ONCE AGAIN REMINDED THE CAPT OF THE ILL-ADVISED MANNER IN WHICH WE ENTERED THE TXWY; TO WHICH HE REPLIED IN THE SAME WAY AS BEFORE. REMAINDER OF FLT WAS UNEVENTFUL. ALTHOUGH GND CTL DIDN'T SAY ANYTHING I COULD TELL BY HER TONE OF VOICE THAT SHE WAS PERTURBED AND CONFUSED BY THE FACT THAT WE WEREN'T WHERE SHE HAD EXPECTED US TO BE. I COULD HAVE APPLIED THE BRAKES; AND BROUGHT THE ACFT TO A SUDDEN STOP; BUT DECIDED NOT TO FOR REASONS OF SAFETY (FLT ATTENDANTS STANDING IN AISLE). SHOULD I HAVE 'WRESTLED THE ACFT' AWAY FROM HIM? I DON'T THINK SO. BUT I'M UNSURE OF HOW TO HANDLE THIS TYPE OF THING IN THE FUTURE. I'M CONSIDERING GOING TO PLT GROUP WITH THIS ONE.