A B757 PERFORMS A GAR ON SHORT FINAL AT DFW DUE TO A COMMUTER TAKING OFF ON RWY 36L AHEAD OF THEM.

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WE WERE FLT XYZ; A B757 AIRLINER; CLRED FOR APCH TO RWY 36L DFW ARPT. CALLED TWR AT OM AND UNDERSTOOD WE WERE CLRED TO LAND RWY 36L. APCHING THE RWY; SAW A COMMUTER TURBOPROP ENTERING OUR RWY. I THOUGHT HE WAS GOING TO CROSS BUT INSTEAD HE TURNED ON RWY AND PROCEEDED TO TAKE OFF. WITH OUR SPD; I FELT WE WOULD OVERTAKE HIM ON THE RWY IF WE LANDED; SO I INITIATED A GAR AND NOTIFIED THE TWR. DURING GAR; TWR SEEMED TO INDICATE HE CLRED US TO LAND ON RWY 36R; BUT NEITHER I NOR THE FO RECALL HEARING RWY 36R. WE WERE NOT ASKED TO SIDESTEP TO RWY 36R OR ASKED IF WE WANTED RWY 36R OR COULD ACCEPT IT. AT NO TIME WAS EITHER ACFT IN DANGER OF HITTING EACH OTHER DUE TO EARLY GAR. I BELIEVE IT WAS AN HONEST MISUNDERSTANDING BTWN US AND THE TWR. I BELIEVE NO ACFT ONCE CLRED FOR AN APCH TO ONE RWY SHOULD BE CLRED TO LAND ON ANOTHER WITHOUT HIS CONSENT. THE ACFT THAT TOOK OFF SHOULD HAVE REFUSED THE TKOF CLRNC SEEING US ON CLOSE FINAL. THE GAR KEPT US ALL SAFE AND OUT OF DANGER. SUPPLEMENTAL INFO FROM ACN 428980: WE WERE SWITCHED TO TWR AT APPROX 12-15 MI OUT ON FINAL AND CLRED TO LAND ON RWY 36L. WE PICKED UP THE RWY AT APPROX 5 MI. AT APPROX 1000 FT AGL WE NOTICED A SMALL COMMUTER ACFT TAXIING ONTO OUR RWY FOR TKOF. THIS SIT REMINDED ME OF THE ACCIDENT AT LAX WHERE THE B737 LANDED ON THE COMMUTER PLANE.