SMT X UNAUTH RWY ENTRY. HAD LTSS FROM SMT Y. PLTDEV.

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SMT CALLED FOR TAXI WITH CURRENT ATIS. I ISSUED TAXI CLRNC TO RWY 13 (OPPOSITE END OF ARPT FROM WHERE ACFT WAS PARKED). PLT READ BACK 'RWY 13.' GND CTL AND CLRNC DELIVERY/FLT DATA WERE COMBINED AND I WAS WORKING BOTH POS. THE NEW HRLY WX WAS RECEIVED AND I WAS PREPARING TO MAKE A NEW ATIS. I LOOKED UP FROM THE WX RPT AND SAW SMT X XING RWY 13 APPROX 2000 FT FROM THE THRESHOLD. LCL CTL ISSUED A TKOF CLRNC TO SMT Y; BUT THE DEP ROLL HAD NOT STARTED. I WAITED UNTIL SMT X COMPLETED XING RWY 13 BEFORE I SAID ANYTHING TO HIM SO HE WOULDN'T STOP IN THE MIDDLE OF THE RWY. I IMMEDIATELY INFORMED LCL OF SMT X XING RWY 13. UNAUTH RWY XING HAD BEEN COMPLETED PRIOR TO THE SMT Y STARTING TKOF ROLL. FACTORS INVOLVED: RWY 13 IS RARELY USED; PLT MAY HAVE CROSSED OUT OF HABIT AS THE TAXI RTE TO OUR MOST OFTEN USED RWY CROSSES RWY 13. I FAILED TO ENSURE THAT THE ACFT TURNED ON PARALLEL TXWY FOR RWY 13 PRIOR TO PERFORMING LOWER PRIORITY FLT DATA DUTIES. PLT IS LOCALLY BASED AND I ASSUMED THERE WOULD BE NO PROB; ESPECIALLY SINCE HE READ BACK 'RWY 13.' RESOLUTION: ENSURE ALL POTENTIAL CONFLICTS ARE RESOLVED PRIOR TO PERFORMING LOWER PRIORITY DUTIES. THIS IS BASIC ATC (ATC 101). HOWEVER IT APPEARS THE 'COMPLACENCY BUG' HAS BITTEN AGAIN. SUPPLEMENTAL INFO FROM ACN 236837: I CALLED ORLANDO GND CTL; EXECUTIVE ARPT; FOR TAXI INSTRUCTION. I WAS INSTRUCTED TO TAXI TO RWY 13. WHILE TAXIING I WAS REVIEWING MY DEP INSTRUCTIONS AND INADVERTENTLY TAXIED ACROSS RWY 13 AND GND CTL INFORMED ME OF MY ACTIONS. I AM FILING THIS RPT TO LET YOU KNOW THAT MY ACTIONS WERE NOT INTENTIONAL; AND I AM AWARE AFTER THE FACT; OF WHAT TOOK PLACE. SUPPLEMENTAL INFO FROM ACN 236840: AFTER COMPLETION OF SCANNING RWY 13 I CLRED SMT Y FOR TKOF ON A HDG. THE PLT QUESTIONED THE HDG AND I RESTATED THE CLRNC. AS I WAS SCANNING THE FINAL; GND CTL ADVISED THAT SMT X WAS XING RWY 13. I OBSERVED SMT X TO BE CLR OF THE RWY AND I OBSERVED SMT Y STILL HOLDING IN POS; THEREFORE I DID NOT CANCEL TKOF CLRNC.