ATR42 CREW WAS GIVEN CONFUSING RWY EXIT CLRNC AT BTV.

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APCHING THE ARPT FROM THE SSW; THE WX WAS VMC; HOWEVER; WE WERE VECTORED BY APCH CTL TO THE E; N AND NW OF THE ARPT DUE TO TFC. ON A 3 MI FINAL TO RWY 15; TWR TOLD US THERE WAS TFC ON A R BASE TO RWY 19 AND THAT HE WOULD PASS TO OUR 'R.' THIS WAS A LITTLE CONFUSING; BUT SINCE WE WERE SO LOW TO THE GND AND ABOUT TO LAND; WE DID NOT QUERY ANY FURTHER. THE CONFUSION STARTED ON THE LNDG ROLLOUT. WE HEARD THE TWR CLRING AN AIRBUS-A320 TO LAND ON OUR RWY; AND WE THOUGHT HE WAS APPROX 2 MI BEHIND US. TWR TOLD US TO EXPEDITE; EXIT THE RWY AND TO HOLD SHORT OF RWY 1-19. I REPEATED THIS; AND WAS SURE HE WANTED US TO EXPEDITE CLR OF THE RWY BECAUSE OF THE A320 ON OUR TAIL; HOWEVER I LATER LEARNED IT WAS BECAUSE HE WANTED TO GET US THROUGH THE 1-19 INTXN BECAUSE THE PIPER WAS ON A SHORT FINAL. WE EXITED RWY 15 AT THE EARLIEST POSSIBLE TIME; BUT WE COULD NOT USE TXWY A BECAUSE THERE WAS A CESSNA THERE. THE NEXT TURN OFF WAS RWY 1-19; WHICH WE TOOK. THE TWR TOLD US 'WE WERE NOT FOLLOWING INSTRUCTIONS' AND WANTED US TO USE A REVERSE HIGH SPD TXWY G THAT WE WERE ALREADY PAST SO WE EXITED THE RWY ON TXWY B. THE PIPER ELECTED TO GO AROUND WITH PLENTY OF ROOM. MY CONCERN IS 2-FOLD: FIRST; ATC SHOULD NOT VECTOR/CLR ACFT TO LAND ON INTERSECTING RWYS; EVEN IN VMC; WITHOUT GREATER SEPARATION THAN WHAT WE HAD; ABOUT 1 SM. SECOND; COMPLETE CLRNCS; ESPECIALLY WITH THE WORDS 'EXPEDITE' SHOULD NOT BE GIVEN ON THE LNDG ROLLOUT; AS THIS IS A CRITICAL PHASE OF FLT.