CAPT OF AN MLG FAILED TO HOLD SHORT OF AN ACTIVE RWY DURING TAXI FOR TKOF.

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AFTER PUSH-BACK FROM GATE; GND CTL DIRECTED US TO TAXI TO RWY 11R; BUT TO HOLD SHORT OF RWY 4. AFTER WE HAD CROSSED RWY 4 WITHOUT FURTHER CLRNC; GND CTL REMINDED US THAT WE HAD BEEN TOLD TO 'HOLD SHORT OF RWY 4' ON OUR INITIAL TAXI INSTRUCTIONS FROM THE GATE. I BELIEVE THAT BOTH CREWMEMBERS FORGOT TO HOLD SHORT OF RWY 4; AND 'GND CTL' FAILED TO NOTICE OUR XING UNTIL TOO LATE BECAUSE: RWY 4/22 IS VERY RARELY USED SIMULTANEOUSLY WITH RWYS 11/29 (L OR R); AND PLTS ARE USED TO NOT HOLDING SHORT. THE HIGH CEILING AND GOOD VISIBILITY CONTRIBUTED TO THE IMPRESSION THAT THIS WAS A 'NORMAL' SIT -- WITH NO 'HOLD SHORT' REQUIRED. LOW VISIBILITY WOULD HAVE PROBABLY CAUSED THE CREW TO REMEMBER TO HOLD SHORT. OBVIOUSLY 'HOLD SHORT' RED LIGHTS WOULD HAVE ALSO PREVENTED THE XING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE WAS MERELY COMPLACENT IN NOT HOLDING SHORT OF THE RWY SINCE USUALLY THIS IS NOT REQUIRED BY TWR SINCE THE XING RWY IS SELDOM USED. HE WILL BE MORE MINDFUL IN THE FUTURE WHEN XING ANY RWY DURING TAXI. HE WAS OPERATING A DC9 TYPE ACFT.