A TWR MODIFICATION TO THE VISUAL APCH CLRNC RESULTS IN AN OVERSHOOT OF FINAL AND A TFC CONFLICT AFTER COMPLIANCE WITH THE NEW CLRNC.

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WE WERE INBOUND TO PBI. WE WERE ON VECTORS WITH APCH CTL FOR A R DOWNWIND TO RWY 9L. AS WE GOT APPROX ABEAM THE NUMBERS; THE CTLR SAID 'CALL THE FIELD IN SIGHT.' WE CALLED THE FIELD IN SIGHT AND THE CTLR CLRED US FOR THE VISUAL TO RWY 9L. WE BEGAN TO TURN OUR BASE LEG; AND THE CTLR CHANGED HIS INSTRUCTIONS; AND SAID 'DON'T TURN FINAL UNTIL OUTSIDE OF THE FAF (RUBIN) FOR NOISE ABATEMENT AND KEEP THE SPD UP. AT THIS TIME WE WERE ALREADY ESTABLISHED ON OUR BASE LEG; SO WE HAD TO TURN OUTBOUND ON A DOWNWIND LEG AND EXTEND IT FOR ANOTHER 2 MI; AND OUR TURNING RADIOS WAS CUT IN HALF DUE TO THE MODIFIED DOWNWIND NEED TO COMPLY WITH THE CTLR'S NEW ORDERS. THIS; COMBINED WITH 'KEEP THE SPD UP;' MADE IT IMPOSSIBLE FOR US TO MAKE A TURN INBOUND AT THE FAF WITHOUT FLYING L OF THE CTRLINE TO GET ESTABLISHED ON FINAL. WHEN THIS OCCURRED; THE CTLR BEGAN SCREAMING 'TFC ALERT; PLANE WITHIN 1 MI' TO ANOTHER ACFT IN THE AREA.. THIS CAME TO A SURPRISE TO US SINCE WE WERE NEVER TOLD ANOTHER PLANE WAS IN OUR IMMEDIATE AREA. WE LANDED UNEVENTFULLY. THIS WAS A CLR CASE OF THE APCH CTLR TRYING TO RUSH TOO MANY PLANES INTO A TIGHT AREA. IF WE HAD KNOWN ANOTHER PLANE WAS SO CLOSE; WE WOULD HAVE REFUSED THE CLRNC FOR A VISUAL APCH. ALSO; WE WERE FIRST GIVEN THE CLRNC FOR A 'VISUAL APCH;' AND THEN 10 SECONDS LATER MORE RESTRICTING ORDERS WERE ADDED TO THE VISUAL APCH CLRNC; AFTER WE WERE ESTABLISHED IN THE PATTERN AND CONFIGURED TO LAND.