B737 FLT CREW NOTES IRREGULAR ENTRY TO DISPLACED THRESHOLD AREA REQUIRED FOR SOME ACFT AT BUR.

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BURBANK WAS DEPARTING RWY 33 DUE TO STRONG WINDS FROM THE N. WE WERE WELL AWARE THAT WE COULD NOT USE TXWY G TO GET TO RWY 33 DUE TO A WINGSPAN RESTR. TAXIING OUT; WE WERE HOLDING SHORT OF RWY 33 AT THE POINT SE OF THE RWY 8-26/33-15 INTXN AWAITING LNDG TFC ON RWY 33. BUR TWR THEN CLRED US INTO POS AND HOLD ON RWY 33 AND TOLD US TO EXPECT A 5 MIN DELAY FOR FLOW INTO LAS. WE PROCEEDED INTO POS AT THE RWY THRESHOLD. ABOUT 20 SECONDS ALTER; I STARTED TO THINK SOMETHING WAS NOT RIGHT; AND I REMEMBERED THAT THE RWY HAD A DISPLACED THRESHOLD. WE TOLD THE TWR THAT WE WOULD MAKE A 180 DEG TURN AND TAXI DOWN TO FULL LENGTH. I MADE A TURN TO THE E; AND REALIZED WHY I INITIALLY WENT INTO POS AT THE DISPLACED THRESHOLD. THE REIL FOR RWY 33 EXTENDS VERTLY A FEW INCHES AND BLOCKS ACCESS TO THE FULL LENGTH OF RWY 33 UTILIZING THE RAMP AREA. THE BUR 10-9 PAGE SHOWS THE RAMP EXTENDING ALL THE WAY TO THE END OF RWY 33; BUT THE LIGHTING PREVENTS ANY ACCESS TO THIS AREA. FURTHERMORE; I THINK THE LIGHTS SUBCONSCIOUSLY GAVE ME THE IMPRESSION THAT I WAS AT THE FULL LENGTH OF THE RWY. HAD WE BEEN CLRED FOR TKOF; I BELIEVE I WOULD HAVE PROCEEDED FROM THE DISPLACED THRESHOLD WITHOUT GIVING IT A SECOND THOUGHT. THE BURBANK 10-9 PAGE; AND THE OPC BOTH INDICATE THAT RWY 33 HAS 6886 FT AVAILABLE FOR TKOF. HOWEVER; FROM THE DISPLACED THRESHOLD; THERE IS ONLY 6536 FT AVAILABLE (350 FT SHORTER). THE REDUCED LENGTH WOULD NOT HAVE BEEN A PROB FOR US; BUT I BELIEVE IT COULD BE A SAFETY RISK FOR FUTURE OPS. IF YOU ARE DEPARTING ON RWY 33 AT BUR AND CANNOT USE TXWY 'G'; THE ONLY WAY TO GET TO THE FULL LENGTH IS TO ENTER THE RWY BEFORE THE DISPLACED THRESHOLD; BACK TAXI ON THE RWY AND MAKE A 180 DEG TURN INTO POS.