CTLR CLAIMS THAT VFR ACFT OFF ADJACENT ARPT HAD A CONFLICT WITH AN IFR ARR.

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L45 IS 7 MI SSE OF BFL. L45 HOSTS SEVERAL EXPERIMENTAL ACFT FLY-INS. RWY 34 DEP COURSE CROSSES BFL RWY 30 ARR COURSE INSIDE BFL'S CLASS D AIRSPACE. I CLRED ACR X; AN SMT; FOR ILS RWY 30R APCH TO BFL. ACR X WAS OUTSIDE THE LOM DSNDING ON THE GS AND REQUESTING MULTIPLE APCHS ON FAA CHKRIDE. I OBSERVED AN ACFT AIRBORNE OFF L45 RWY 34 MAKING A R DOWNWIND DEP; XPONDER/MODE C ON. BFL ILS COURSE IS ALIGNED WITH EHF VORTAC V-197 PMD. I ISSUED TFC TO ACR X; THEN A SAFETY ALERT TO REMAIN AT OR ABOVE PRESENT ALT. THE UNKNOWN ACFT WAS 12 O'CLOCK; 2 MI; OPPOSITE DIRECTION; 2000 MSL CLBING. THE UNKNOWN ACFT MERGED; ALT INDICATED 2500 MSL CLBING. ACR X INDICATED 3300 MSL. ACR X NEVER SAW ACFT AND CROSSED THE LOM ABOVE GS. THE UNKNOWN ACFT NEVER CALLED FOR RADAR SVC. IF THE UNKNOWN ACFT DID NOT HAVE MODE C OR DIDN'T TURN XPONDER ON; THE MARGIN OF SAFETY WOULD HAVE BEEN REDUCED. SOLUTIONS: 1) GIVE BFL CLASS D EXTENSION TO INCLUDE APCH. 2)PUT UP SIGN AT L45 'NO R TURNOUT RWY 34!' 3) PUBLISH IN ARPT/FACILITY DIRECTORY. NOTE: 1) OVER 5 YRS OF NASA RPTS ON SIMILAR INCIDENTS. I SEE NO IMPROVEMENT OR PLT EDUCATION. 2) NILEY OM IS USED FOR NAV BY L45 ACFT.