PA34 PLT REFUSES TO ACCEPT CTLR VECTORS CLR OF FINAL APCH COURSE FOR DSNDING ARR TFC.

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I WAS RELIEVING A CTLR OFF OF THE N DEP SECTOR AT CVG AND AS I PLUGGED IN; THE CTLR ISSUED ACFT #1; PA34; A L TURN HDG 330 DEGS AND HE REFUSED THE TURN. THE CTLR ISSUED THE TURN BECAUSE HIS RTE OF FLT WAS NNW AT 8500 FT; WHICH WAS TAKING HIM THROUGH THE R DOWNWIND TO RWY 18R; IN THE MIDDLE OF AN ARR PUSH WITH ACFT DSNDING FROM 9000 FT TO 7000 FT. THE CTLR TERMINATED RADAR SVC ON ACFT #1 SINCE HE WOULD NOT COMPLY WITH CTL INSTRUCTIONS. ACFT #1 RESPONDED WITH 'I WILL HAVE MY CONGRESSMAN LISTEN TO THESE TAPES AND WRITE A LETTER;' SO THE CTLR TOLD HIM TO REMAIN ON HIS CODE AND SAID THERE WILL BE SEVERAL ACFT DSNDING FROM 9000 FT TO 7000 FT AND SOME WILL BE HVY JETS. ABOUT 5 MINS LATER; THE SUPVR ASKED ME TO HAVE THE PLT OF ACFT #1 CALL THE FACILITY. WHEN I ASKED ACFT #1 TO CALL THE FACILITY; HE WANTED TO KNOW WHY AND QUOTED A COUPLE OF PHRASES OUT OF THE PLT/CTLR GLOSSARY AND THAT HE DID NOT HAVE TO ACCEPT TURNS. WHEN ACFT #1 CALLED THE FACILITY; HE STATED THESE SAME THINGS AND TOLD US HE IS PART OF A PLT GROUP FOR VFR PLTS; AND ENCOURAGES PLTS FLYING VFR THROUGH THE AREA NOT TO CALL; BECAUSE THEY GET VECTORED OUT OF THE WAY AND IF THEY DO NOT CALL ATC; ATC WILL MOVE THE COMMERCIAL TFC AROUND THEM. I FELT THIS WAS UNSAFE. SOME VFR PLTS DO NOT DISPLAY OR HAVE MODE C; SOMETIMES IT'S SO BUSY THE TFC CALL DOES NOT GET ISSUED IN A TIMELY MANNER OR WORSE CASE NOT ISSUED AT ALL UNTIL A PLT ADVISES THAT HE/SHE IS RESPONDING TO A TCASII RA. CVG IS A LEVEL 5 FACILITY (ONE OF THE HIGHEST LEVELS AND 22ND BUSIEST ARPT IN THE UNITED STATES). WHEN OUR PROPOSED CLASS B AIRSPACE TAKES EFFECT -- WHO KNOWS WHEN -- IT WILL ONLY HAVE AN UPPER LIMIT OF 8000 FT; WHICH DOES NOT PROTECT AN ARR UNTIL THEY ARE ABEAM THE ARPT DSNDING ON THE DOWNWIND. I FEEL THIS IS NOT ADEQUATE.