CREW INTO STL RPTS TFC AND ARPT IN SIGHT AND IS CLRED FOR A VISUAL APCH. RPTR CLAIMS BECAUSE HE WAS CLRED WHILE VERY HIGH; IT WAS DIFFICULT TO MAINTAIN VISUAL SEPARATION FROM THE OTHER ACFT LNDG ON THE PARALLEL RWY.

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I WAS FLYING FROM THE R SEAT DURING THE SECOND LEG OF A LINE CHK ADMINISTERED BY ME. WE WERE PLACED ON A RADAR DOWNWIND LEG FOR RWY 12L AT ST LOUIS AT 6000 FT MSL. ABOUT 10 MI NW OF THE ARPT; WE WERE GIVEN A HDG OF 210 DEGS AT 200 KTS. ONCE ESTABLISHED; WE WERE ASKED IF WE SAW COMPANY TFC AT 5000 FT MSL MAKING AN APCH TO RWY 12R. WE SAID WE HAD THE ACFT AND THE ARPT. WE WERE CLRED FOR THE VISUAL TO RWY 12L. I TUNED IN THE RWY 12L ILS FOR GS REF KNOWING WE WERE WELL ABOVE. I SLOWED TO ABOUT 130 KTS IN ORDER TO DSND TO THE GS. APCH; SEEMINGLY CONCERNED ABOUT THE ACFT ON THE R RWY; KEPT ASKING IF WE WERE PROCEEDING TO THE ARPT. WE WERE; IN FACT; HEADED STRAIGHT TOWARD THE RWY 12L THRESHOLD. THE RWY 12R TFC WAS WELL BELOW US. MY CONCERN IS THAT STL IS ISSUING VISUALS TO ACFT IN POS REQUIRING HIGH DSCNTS BECAUSE OF AN APCH TO A PARALLEL RWY LESS THAN 1300 FT CTRLINE TO CTRLINE. ASKING THE CREWS TO PERFORM HIGH DSCNT MANEUVERS WHILE MAINTAINING VISUAL CONTACT ON TFC IS MOST DIFFICULT IN A TRANSPORT ACFT. WE HAVE SOME VERY NEW CREWS FLYING AND I'M CONCERNED THEY WILL BE TALKED INTO UNSTABILIZED; DANGEROUS APCHS MUCH LIKE THE SALT LAKE B727 ACCIDENT OF YRS PAST. AS A MGR; I EMPHASIZE TO OUR INSTRUCTORS TO EDUCATE THE CREWS ABOUT THE IMPORTANCE OF STABLE APCHS. ATC IS ISSUING SOME VERY IFFY CLRNCS AND I SEE PROBS AHEAD. APCH SHOULD GET THE ACFT FAR ENOUGH FROM THE RWY TO ISSUE THE VISUAL ON NO MORE THAN A 3 1/2 - 4 DEG SLOPE.