UNAUTH TKOF PENETRATION OF CLASS D AIRSPACE.

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ON MAY/XX/94 AT BURBANK; CA; ARPT; AT ABOUT 00 LCL TIME; I OBTAINED A WX BRIEFING FOR A VFR ROUND ROBIN FLT TO SANTA BARBARA. I COMPLETED MY PREFLT; OBTAINED THE ATIS; A DEP CLRNC AND TAXI INSTRUCTIONS TO RWY 15. I DID MY RUNUP AND RPTED READY AT 15 TO THE TWR. THE TWR DIRECTED ME TO HOLD SHORT OF RWY 15. I ACKNOWLEDGED AND HELD SHORT. AN ACR 737 TAXIED UP ON TXWY ALPHA; ACROSS THE RWY; OBTAINED TKOF CLRNC AND TAXIED ONTO THE RWY AND TOOK OFF. DURING THE 737 TKOF RUN; I OBSERVED AND MENTALLY NOTED THE 737'S ROTATION POINT. ABOUT THIS TIME THE TWR CLRED ME ONTO RWY 15 CAUTIONING ME OF JET BLAST AND THE CLRNC WAS 'AT MY DISCRETION.' I READ BACK THE INSTRUCTION. AFTER I WATCHED THE 737 WELL OUT OF ANY DANGER FOR JET BLAST I TAXIED TO THE NEAR END OF RWY 15; STOPPED; DROPPED 10 DEGS OF FLAPS AND APPLIED FULL THROTTLE WITH THE BRAKES ON; TURNED ON MY XPONDER AND STROBE LIGHTS; AND RELEASED BRAKES FOR A SHORT FIELD TKOF TO BE CLRLY ABOVE THE WAKE TURB. THE TWR ASKED ME TO TURN R; WHICH I ACKNOWLEDGED AND TURNED R AT ABOUT 400 FT AGL. THE TWR ASKED ME TO CALL THE TWR WHICH I DID UPON LNDG. I WAS INFORMED THAT I HAD NOT BEEN GIVEN CLRNC FOR TKOF. IT SEEMS THAT THERE WAS A COMMERCIAL ACFT ON FINAL FOR RWY 8; AN INTERSECTING RWY. AS I COMPLETED MY TURN AT ABOUT 500 FT AGL; I OBSERVED THE ACFT ON FINAL AND TOUCHING DOWN. IN MY MIND; AT LEAST; THE CLRNC ON THE RWY COUPLED WITH THE 'AT YOUR DISCRETION' AND THE WARNING ABOUT THE RECENTLY DEPARTED ACFT EQUATED TO A CLRNC FOR TKOF AS SOON AS I WAS ASSURED THAT THE PRECEDING ACFT PRESENTED NO HAZARD. I THOUGHT THAT I WAS CLRED TO TKOF. THERE IS NO REASON IN THE WORLD FOR ME TO BE GIVEN POS AND HOLD IN THE PRESENCE OF JET BLAST; IF I WOULD HAVE TO REMAIN ON THE RWY FOR SEVERAL MINUTES WHILE ANOTHER ACFT LANDED ON ANOTHER RWY AND TAXIED ACROSS MY RWY AS IS REQUIRED TO REACH THE TERMINAL. I WAS UNAWARE OF ANY IMPENDING LNDG OF ANOTHER ACFT. NEITHER END OF RWY 8/26 NOR THE APCH TO RWY 8 IS VISIBLE FROM RWY 15 DUE TO THE PRESENCE OF MANY LARGE HANGARS. THERE WAS NO CONFLICT; NO GAR; NO NEAR MISS; ONLY COMS RECEPTION OR COMPREHENSION PROB. CORRECTIVE ACTIONS FOR THE PLT: COMPREHEND AND REMEMBER WHAT YOU HEAR; EVEN IF IT WOULD APPEAR ILLOGICAL. AVOID ANY 'AT YOUR DISCRETION' DECISIONS TO ACT UNLESS YOU FULLY COMPREHEND THE POSSIBILITIES. DON'T EQUATE A 'CAUTION WAKE TURB OR JET BLAST' WARNING AS BEING NECESSARILY COUPLED WITH A TKOF OR LNDG CLRNC. FOR THE AIR TFC CTLR: AVOID 'POS AND HOLD' ORDERS IF THERE'S CLRLY GOING TO BE A SUBSTANTIAL WAIT OR IF THERE IS A RISK OF DANGER FROM A PRECEDING ACFT. AVOID 'AT YOUR DISCRETION' DIRECTIONS. IF THERE IS A MANDATORY CLRNC NEEDED SHORTLY THEREAFTER TO AVOID THE PLT CONSIDERING THE DISCRETIONARY ACTION TO BE GREATER THAN INTENDED BY THE ATC.