A GIV PILOT DISREGARDED TRACON'S VECTOR INSTRUCTIONS BECAUSE HE WANTED TO FLY A LOC APPROACH THUS CAUSING A LOSS OF SEPARATION WITH A DEPARTING DC-9.

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WE WERE CLRED DIRECT TO UOX. THE CAPT DECIDED HE WANTED TO FLY TO THE OUTER FIX ON THE LOC WHICH WAS EDENT WHICH IS 9.2 MI FROM THE ARPT. I HAD REQUESTED WITH ATC FOR DIRECT EDENT BUT WAS DENIED. I TOLD THE CAPT THAT WE SHOULD FLY TO THE ARPT AND NOT TO EDENT. HE DID NOT COMPLY. WE WERE THEN GIVEN A TURN FROM OUR PRESENT COURSE TO A 090 DEG HDG TO ALLOW AN ACR DC9 TO CONTINUE HIS CLB. SEPARATION WAS NOT ACHIEVED AS THE CTLR HAD ASSUMED BECAUSE WE WERE DEVIATING FROM OUR ASSIGNED PATH. ONCE CLR OF THE TFC ATC CLRED US DIRECT EDENT. I HAVE FOUND THAT ATC ALLOWS CPR ACFT TO DEVIATE FROM ASSIGNED CLRNCS THAT THEY NEVER ALLOWED WHEN I FLEW FOR AN AIRLINE. THIS REINFORCEMENT OF NON-ACTION TO THE CAPT THAT I WAS FLYING WITH HAS ALLOWED HIM TO BREAK RULES OVER THE MANY YRS HE HAS FLOWN. BETTER TRAINING AT THE CPR LEVEL FROM FLT SAFETY WOULD HELP. TRAINING IN THE CPR FIELD IS STRUCTURED FOR A SPECIFIC ACFT NOT THE SYS. I SHOWED POOR JUDGEMENT ON NOT FORCING THE ISSUE AND PERSUADING THE CAPT TO FLY THE ASSIGNED RTE. THE CAPT IS OUR CHIEF PLT SO AS THE EMPLOYEE IT IS DIFFICULT TO TELL HIM WHAT TO DO. CRM TRAINING AND HUMAN FACTORS TRAINING FOR OUR DEPT WOULD BE HELPFUL.