FLC OF MDT COMMUTER TURNED OFF RWY ASAP AFTER LNDG. FOLLOWED AN SMA TAXIING. HAD MINOR CONFLICT WITH ACR MLG WANTING TO TAXI ON THEIR TAXIWAY. TWR CHASTISED COMMUTER CAPT FOR NOT WAITING FOR TAXI INSTRUCTION.

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UPON ARR IN THE AMA AREA; WE WERE SEQUENCED INTO THE LNDG SEQUENCE. OUR FLT WAS PLACED BEHIND AN SMA ON APCH. IN ORDER TO MAINTAIN A SAFE DISTANCE BEHIND THE SMA WE SLOWED TO VREF (APPROX 100 KTS). WE WERE FOLLOWED IN THE LNDG SEQUENCE BY SEVERAL OTHER ACFT. THE TWR CTLR SEEMED EXTREMELY BUSY. ON SHORT FINAL; THE SMA WAS INSTRUCTED TO EXPEDITE OFF OF THE RWY AS OUR FLT WAS CLOSELY BEHIND. WE HEARD NO OTHER INSTRUCTIONS ISSUED TO THE SMA AFTER THE SMA CLRED THE RWY; WE WERE CLRED AND DID LAND. REALIZING THAT THERE WERE NUMEROUS ACFT IN THE ARR SEQUENCE; WE PLANNED TO EXIT THE RWY ASAP AT ALPHA. AFTER TOUCHDOWN AND DURING ROLLOUT; THE MTR WENT AROUND; PASSING TO OUR L. WE RECEIVED NO TAXI OR RADIO INSTRUCTIONS PRIOR TO EXITING THE RWY (04) AT ALPHA. SINCE WE HAD RECEIVED NO TAXI OR RADIO FREQ INSTRUCTIONS PRIOR TO EXITING THE RWY; WE TUNED AMA GND AND DETERMINED THAT THE SAME CTLR WAS WORKING BOTH FREQS. NOT WISHING TO IMPEDE ANY OTHER ARRS FROM EXITING THE RWY AT ALPHA; AND TAXIWAY PAPA APPEARING CLR; WE FOLLOWED THE SMA ON TAXI TOWARD THE TERMINAL. DURING THIS TIME; CONVERSATION BY THE CTLR WAS PRETTY MUCH CONTINUOUS. AS WE APCHED THE XX TURNOFF; AN MLG STATED THAT SOMEONE WAS ON THE TAXIWAY. UPON INQUIRY BY THE CTLR; WE ACKNOWLEDGED THAT WE WERE ON 'PAPA'. THE CTLR THEN CHASTISED US FOR NOT CALLING HIM AND INSTRUCTED US TO UTILIZE THE XX TURNOFF AND ALLOW THE MLG TO PASS AFTER CONFIRMING THAT WE COULD DO SO. AFTER THE MLG PASSED; WE WERE GIVEN TAXI INSTRUCTIONS TO THE RAMP. WHEN DEPARTING THE AMA AREA; WE INQUIRED THROUGH OUR STATION AS TO ANY POSSIBLE PROBLEM AND WERE TOLD THAT WE WERE TO CONTACT THE TWR FOR INSTRUCTIONS PRIOR TO EXITING THE RWY. SINCE THIS REQUIREMENT COULD SERIOUSLY HAMPER SAFETY; I MADE FURTHER INQUIRY WITH OUR FLT CTL. FLT CTL ADVISED THAT WE WERE TO EXIT THE RWY; STOP; THEN CONTACT GND. EACH OF THESE SCENARIOS SEEMS TO BE INHERENTLY FILLED WITH POSSIBLE SAFETY PROBLEMS. THE ISSUES ARE: WHEN NOT ISSUED A TAXI OR RADIO FREQ INSTRUCTIONS PRIOR TO EXITING A RWY; SHOULD THE PLT: 1) CONTINUE TO TAXI WHILE MONITORING FOR INSTRUCTIONS; THUS INTERCEPTING CONVERGING TFC? 2) CONTINUE TO TAXI WHILE CALLING FOR INSTRUCTIONS; THUS INTERCEPTING CONVERGING TFC? 3) CLR THE RWY AND STOP; THUS CAUSING FOLLOWING TFC TO STOP ON THE RWY UNTIL INSTRUCTIONS RECEIVED? 4) STOP IN THE RWY UNTIL TAXI AND RADIO INSTRUCTIONS ARE RECEIVED; THUS CAUSING FOLLOWING TFC TO GAR? WHEN THE CTLR IS EXTREMELY BUSY; TFC IS HVY; AND ONLY ONE PATH TO/FROM A RWY AVAILABLE; WHAT DOES THE PLT DO?