CTLR VOICED CONCERN REGARDING A LCL HELI OPERATOR WHO ALLEGEDLY CONDUCTS ARPT MOVEMENTS WITHOUT APPROPRIATE ATC CLRNCS.

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RWY XX IN USE; VMC. I WAS WORKING ALL OF THE FUNCTIONS IN THE TWR: LCL CTL; GND CTL; AND CLRNC DELIVERY. A HELI REQUESTED A DEP CLRNC TO THE N; FOR ABOUT 50 MI; AT 1000 FT. I TOLD HIM TO 'STAND BY FOR COORD.' AN ACR ON 3 MI FINAL THEN CALLED; AND I CLRED THAT ACFT TO LAND. ACFT X THEN INFORMED ME 'ON TXWY B; READY FOR DEP.' I HAD NOT ISSUED A CLRNC FOR ACFT X TO TAXI ONTO A MOVEMENT AREA. I THEN CALLED E RADAR TO COORD 'ON COURSE' FOR THE DEP; AND TO KEEP ACFT X ON TWR FREQ; UNTIL HE CLRED THE CLASS C AIRSPACE. AFTER ISSUING TKOF CLRNC; I OBSERVED ACFT X DEPART N FOR ABOUT 1.5 - 2 MI; BEFORE MAKING AN ABRUPT TURN TO THE L; WESTERLY. AFTER WAITING SEVERAL SECONDS TO SEE IF HE WOULD RESUME A NORTHERLY FLT; I ASKED HIS HDG. HE REPLIED '270;' AND THAT HE HAD 'RECEIVED A REVISED ROUTING.' SINCE ACFT X WAS NOW ENTERING W RADAR AIRSPACE; I THEN COORD WITH THE W RADAR CTLR. THIS TOOK A COUPLE OF EFFORTS; DUE TO W RADAR BEING BUSY WITH OTHER ACFT. THERE HAVE BEEN NUMEROUS RPTS FROM CTLRS TO SUPVRS; OF THIS ACFT TAXIING ONTO MOVEMENT AREAS WITHOUT AUTH. UNFORTUNATELY; NOT ONE SUPVR HAS CALLED THE OPERATOR TO WARN THEM OF THE HAZARDS OF SUCH ACTIVITY; AND CORRECT THEM. ONE SUPVR RECENTLY EVEN TOLD A CTLR THAT IT WAS NOT HIS JOB TO DO SO. IN ADDITION; THE UNEXPECTED 90 DEG TURN CAUSES GREAT CONCERN. THE APCH CTLR EXPECTED THE FLT TO BE AS I COORD. THE TURN INTO W RADAR AIRSPACE CAUSED ME TO IMMEDIATELY HAVE TO TURN MY ATTN TO COORDINATING WITH W RADAR. THERE WAS NO TFC THAT WAS A FACTOR; BUT THERE COULD HAVE BEEN. OFTEN; THERE ARE ACFT OPERATING AT LOW LEVELS; ON SIGHT-SEEING TRIPS; OR TAKING PHOTOGRAPHS; AS THIS IS A POPULAR AND SCENIC TOURIST DEST; AND THE AREA IS EXPERIENCING TREMENDOUS GROWTH; AND THAT INCLUDES THE IMMEDIATE ARPT AREA.