CAPT OF A FOKKER 100 TAXIED OVER RWY HOLD SHORT LINE ON CLE ARPT IN ORDER TO ATTEMPT CLRING THE PARALLEL RWY BEHIND HIS ACFT ON WHICH A B737 WAS ON SHORT FINAL.

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ACFT WERE LNDG RWY 5R AND DEPARTING RWY 5L; SO DEPS WERE HAVING TO CROSS RWY 5R TO TAXI ON RWY 5L FOR TKOF. THE 2 RWYS ARE VERY CLOSE TOGETHER. THE HOLD SHORT LINE FOR RWY 5L IS BARELY OFF THE EDGE OF RWY 5R AND VICE VERSA. WITH TFC ON APPROX 3 MI FINAL FOR RWY 5R; WE WERE 'CLRED TO CROSS RWY 5R AND HOLD SHORT OF RWY 5L.' ANOTHER ACFT WAS IN POS AND ABOUT TO TAKE OFF ON RWY 5L. AS WE HUSTLED ACROSS RWY 5R EXPECTING TO BE ABLE TO TAXI CLR; WE ENCOUNTERED THE HOLD SHORT LINE FOR RWY 5L JUST PAST THE EDGE OF RWY 5R. AS I WASN'T EXPECTING THIS; I WENT PAST THE HOLD SHORT LINE FOR RWY 5L BY SEVERAL FT; BUT ALMOST ALL OF MY PLANE WAS STILL EXTENDING ONTO RWY 5R; THE RWY WITH A PLANE ON RELATIVELY SHORT FINAL. AS CONFUSION CAME QUICKLY; SELF-PRESERVATION MADE ME TAXI CLOSER TO RWY 5L; AS I TRIED TO CLR RWY 5R. AT THE SAME TIME; WE RECEIVED OUR CLRNC TO 'TAXI INTO POS' ON RWY 5L AND WE DID SO. THIS WAS A VERY UNSAFE SIT; AND A CLRNC; THAT AFTER THE FACT; WE WERE UNABLE TO COMPLY WITH. WE COULD EITHER CROSS RWY 5R OR HOLD SHORT OF RWY 5L; BUT NOT BOTH. THE CORRECT CLRNC; ALTHOUGH STILL UNSAFE WITH LNDG TFC LESS THAN A 3 MI FINAL; WAS TAXI ONTO RWY 5R; HOLD SHORT OF RWY 5L. A CLRNC TO CROSS A RWY; IS TO CROSS IT SO YOUR TAIL DOES NOT EXTEND BEHIND THE HOLD SHORT LINE AFTER XING. CLRLY; THIS COULD NOT BE DONE WITHOUT SIMULTANEOUSLY XING THE HOLD SHORT LINE WITH MY NOSE FOR RWY 5L. THIS PROC NEEDS TO BE ADDRESSED; AS THIS IS SETTING UP SOMEONE FOR A VIOLATION; A GAR; OR A NEAR-MISS; OR ALL 3 AT THE SAME TIME; POSSIBLY AN ACCIDENT WAITING TO HAPPEN.