MD80 FLT CREW REPORTS ROLLING 5 FT PAST THE HOLD LINE FOR RWY 22 ON FOXTROT AT LGA AFTER BEING INSTRUCTED TO HOLD SHORT; TO CLEAR THE BRAVO TXWY. THE FLT CREW IS NOTIFIED LATER THAT LGA TOWER INTENDS TO FILE A VIOLATION AGAINST THEM.

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LGA GND CTL CLRED ME TO TAXI TO RWY 13 VIA TXWYS G; B; F; HOLD SHORT OF RWY 22. WHEN I TURNED ONTO TXWY F I NOTICED THE HOLD SHORT LINE WAS PAINTED HALFWAY BTWN TXWY B AND RWY 22. I KNOW THIS IS TO KEEP LARGE ACFT FROM PUTTING THEIR R WING OVER RWY 22. AS I APCHED THE HOLD SHORT LINE I DETERMINED THAT IF I STOPPED RIGHT THERE; I WOULD LEAVE MY TAIL ON TXWY B; BUT I STILL HAD A LOT OF ROOM AHEAD OF ME WITHOUT ENCROACHING ON RWY 22. I SLOWED BELOW NORMAL TAXI SPD AND CROSSED THE HOLD SHORT LINE. THE FO QUERIED ME; 'WE ARE GOING TO HOLD SHORT OF RWY 22 RIGHT?' I SAID; 'YES; BUT I WANT MY TAIL CLR.' THE FO VISUALLY CHKED RWY 22 AND MONITORED OUR SPACING. I ROLLED 4 OR 5 FT BEYOND THE HOLD SHORT LINE AND STOPPED. NO PART OF MY ACFT TOUCHED RWY 22. AS I STOPPED; AN ACFT LNDG ON RWY 22 PASSED TXWY F AND GND CLRED ME TO CONTINUE TAXIING ACROSS RWY 22; TXWYS E; CC; HOLD SHORT OF TXWY G. ALL COMS WITH GND WERE ROUTINE. THEY DID NOT EXPRESS ANY CONCERN ABOUT MY ACTIONS; OR ASK ME TO CONTACT THEM. 5 HRS LATER I WAS ASKED TO CONTACT LGA TWR. THEY NOTIFIED ME THAT; 'THEY CLRED ME TO CROSS RWY 22 BECAUSE THEY THOUGHT I WAS GOING TO DO THAT ANYWAY; SO WE'RE GOING TO FILE AGAINST YOU.' THEY WOULD NOT SAY THAT I ACTUALLY ENCROACHED ONTO RWY 22 PRIOR TO RECEIVING CLRNC TO CROSS. WHEN I EXPLAINED THAT I THOUGHT I COULD BOTH HOLD SHORT OF RWY 22; AND NOT BLOCK TXWY B; THEY SAID; 'WE DON'T NEED YOUR HELP.'