MD80 FLC SEES XING TFC WHILE ON ROLLOUT ON RWY AT DFW.

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MY ACFT HAD BEEN CLRED TO LAND ON RWY 18R. WE HAD NOT BEEN GIVEN A LAND AND HOLD SHORT CLRNC. THE FO WAS FLYING THE ACFT. HE TOUCHED DOWN SLIGHTLY LONG AND MAYBE 5 KTS FAST. IT WAS OBVIOUS THAT WE WERE NOT GOING TO MAKE THE HIGHSPD TXWYS E3 OR E5. PASSING TXWY E5 AT ABOUT 80 KTS; THE TWR CLRED ACR X TO CROSS RWYS 18R AND 18L ON TXWY A. THE ACR HAD LANDED ON RWY 13R. THE ACR STARTED TO CROSS THE RWY IN FRONT OF US; WHEN THE TWR ASKED US IF WE COULD MAKE THE NEXT HIGHSPD; TXWY E6. I ANSWERED UNABLE AND WE CLRED THE RWY ON TXWY B JUST AS THE ACR FINISHED CLRING. HAD WE BEEN ANY FASTER; THERE WOULD HAVE BEEN A GOOD CHANCE THAT WE WOULD HAVE HIT THE JET AT THE INTXN OF TXWY A AND RWY 18R. WHILE WE MAY HAVE BEEN A LITTLE FAST ON LNDG; AND HAVE NOT AGGRESSIVELY SLOWED THE ACFT; WE DID NOT KNOW THAT THE TWR WAS GOING TO CLR ANOTHER ACFT TO CROSS OUR RWY DURING THE LNDG ROLLOUT. SINCE WE HAD NOT BEEN ISSUED A LAND AND HOLD SHORT CLRNC; ANOTHER ACFT SHOULD NOT BE ALLOWED TO CROSS IN FRONT OF AN ACFT THAT IS IN THE PROCESS OF THE LNDG ROLLOUT.