B737-700 FLT CREW IS CONCERNED WITH TERRAIN CLRNC DURING A VISUAL APCH TO RWY 28R AT BOI.

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I WOULD LIKE TO CALL ATTN TO A PRACTICE WHICH I BELIEVE COULD RESULT IN A DREADFUL MISHAP. SIMILAR EVENTS HAVE OCCURRED TO ME AT BOTH BOI AND ABQ ARPTS IN THE RECENT PAST. SPECIFICALLY; APCH AND TWR CTLRS ARE VECTORING ACFT FOR VISUAL APCHS TO THE SIDE OF THE ARPT THAT IS IN CLOSE PROX TO STEEPLY RISING TERRAIN. THESE VECTORS ARE CAUSING OUR PLTS TO WALK A FINE LINE BTWN MEETING ALL STABILIZED APCH CRITERIA AND AVOIDING DEADLY TERRAIN. TODAY AT BOI WE WERE ARRIVING FROM THE NW AND WERE DIRECTED TO EXECUTE A VISUAL APCH FROM THE N SIDE OF THE ARPT -- FORCING US TO FLY THROUGH A VERY SMALL WINDOW IN WHICH WE COULD SAFELY AVOID TERRAIN AND EXECUTE A STABILIZED APCH. FROM THAT SIDE OF THE ARPT THERE IS AN EXTREMELY SMALL MARGIN FOR ERROR. ON THE OTHER HAND; THE S SIDE OF THE ARPT IS WIDE OPEN WITH NO PROX TO TERRAIN. AN EXACERBATING FACTOR IS THE REQUIREMENT AT BOI TO MAINTAIN 4500 FT UNTIL ESTABLISHED ON FINAL; PRESUMABLY FOR NOISE ABATEMENT. AS THE VALLEY BECOMES NARROWER E OF THE ARPT; THAT REQUIREMENT MAKES IT EVEN MORE DIFFICULT TO EXECUTE A SAFE APCH. A SIMILAR SITUATION IS OCCURRING AT ABQ WHERE ACFT FROM THE W ARE DIRECTED TO THE N OF THE ARPT FOR VISUAL APCHS TO RWY 26. THERE IS EXTREMELY STEEP TERRAIN BOTH N AND E OF THE FIELD. WHAT WAS PARTICULARLY TROUBLING ABOUT THE APCH AT ABQ IS THAT IT WAS AT NIGHT. WE WERE FORCED TO RELY IN PART ON GPWS DISPLAYS TO FLY DOWN THE VALLEY AND EXECUTE OUR BASE AND FINAL TURNS IN ORDER TO COMPLETE THE APCH. AGAIN; TO THE S OF ABQ ARPT THERE IS MINIMAL TERRAIN HAZARD. ALTHOUGH SCORES OF AIRPLANES SAFELY COMPLETE THESE APCHS EVERY DAY; I BELIEVE THAT A RISK IS BEING TAKEN UNNECESSARILY. ATC SHOULD BE ABLE TO PROVIDE (AND SHOULD DIRECT AUTOMATICALLY) A L DOWNWIND TO EACH OF THESE RWYS IN ORDER TO ELIMINATE ANY CHANCE OF TERRAIN CONTACT. THE APCH TO BOI WAS MARGINALLY ACCEPTABLE IN THE DAYLIGHT IF ONLY BECAUSE WE COULD SEE THE TERRAIN AND COMFORTABLY AVOID IT. AT NIGHT; HOWEVER; THE SITUATION IS UNSAFE. THE SAME COMMENT GOES FOR ABQ. AT NIGHT WITH NO VISUAL REF TO THE TERRAIN OTHER THAN THE ABSENCE OF CITY LIGHTS; AIRPLANES HAVE NO BUSINESS TRYING TO HIT THOSE GATES WHERE THE PENALTY FOR EVEN A SMALL ERROR IS UNTHINKABLE. THERE MUST BE A WAY TO ALLOW ARRIVING AIRPLANES TO USE THE SAFER SIDE OF THE ARPT WHILE MAINTAINING SEPARATION FROM DEPARTING TFC.