PLT OF A PIPER COMANCHE STOPPED TAXIING AND HELD FOR LNDG TFC ON ACTIVE RWY TO WHICH HE WAS CLRED TO CROSS.

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ON AUG/XA/99 I WAS IFR FROM DUT; AZ; TO LAS; NV. AFTER HDOF FROM ZLA TO LAS APCH; I WAS ASKED TO MAINTAIN AIRSPD AS I WAS BEING FOLLOWED BY A FASTER ACFT. AT THE TIME I WAS ON BASE FOR RWY 19R AND ADVISED APCH I WOULD MAINTAIN 170 KTS. APCH CHANGED MY RWY TO RWY 19L; CLRED ME TO LAND; AND ADVISED ME TO EXPEDITE. I LANDED AT 110 KTS AND WAS ADVISED TO EXPEDITE MY EXIT FROM RWY 19L AND STAY ON FREQ. I MAINTAINED 40 KTS (AS PER ASI) AND TURNED OFF RWY AS SOON AS ABLE. I WAS CLRED ACROSS RWY 19R AND ACKNOWLEDGED MY INSTRUCTIONS. I CROSSED THE PARALLEL TXWY BTWN RWY 19L&R; MAINTAINING 40 KTS IN ORDER TO CROSS RWY 19R AS QUICKLY AS POSSIBLE; JUST PRIOR TO ENTRY TO RWY 19R (APPROX 100 FT) I LOOKED R AND OBSERVED A TWIN ENG COMMERCIAL ACFT ABOUT TO TOUCH DOWN ON RWY 19R (I ESTIMATE THE APCHING ACFT WAS APPROX 50-100 FT FROM TOUCHDOWN). IN MY JUDGEMENT; I BELIEVED I WOULD NOT BE ABLE TO CROSS RWY 19R IN SUFFICIENT TIME TO CLR THE LNDG ACFT'S PATH. I APPLIED MY HAND BRAKE AND STOPPED PAST THE RWY ENTRY MARKERS BUT SHORT OF COMPLETE ENTRY ONTO RWY 19R. THE ONCOMING (LNDG) ACFT ADVISED THE TWR OF ITS INTENTION TO 'GO AROUND;' WHICH WAS ACKNOWLEDGED BY TWR AND STATED THAT IT WAS A RWY INCURSION AND CLRED THE ACFT FOR THE GAR. AS PIC; I TOOK WHAT I BELIEVE TO BE 'IN THE INTEREST OF SAFETY' THE ONLY POSSIBLE ACTION IN ORDER TO PREVENT A BAD SIT FROM BECOMING WORSE.