B757 FLC CONCERNED WITH HELI TCASII ACTION ON SHORT FINAL RWY 9L AT MIA.

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ON ARR INTO MIA AFTER CLRED FOR APCH TO RWY 9L. AT ABOUT 100 FT ON GS; WE RECEIVED TCASII ADVISORY TO CLB. WE STARTED PROC AND INFORMED TWR. TWR THEN ADVISED US ABOUT HELIS BTWN RWY 9L AND RWY 9R. AFTER LNDG; I CALLED TWR AND ASKED WHY THE HELIS WERE THERE. HE RESPONDED THAT THEY WERE ALLOWED AND WERE PROBABLY IN TRANSITION. HE APOLOGIZED IF ATC HAD NOT INFORMED US PRIOR TO THE TCASII ADVISORY. I SEE THIS A LOT IN MIA; BUT NORMALLY THE HELIS ARE AT 500 FT -- WELL BELOW THE GS. IN THIS INCIDENT THE HELI WAS VERY; VERY CLOSE AND RIGHT N OUR ALT. MY ADVICE WOULD BE TO PUT THESE HELIS; OR ANYONE ELSE IN TRANSITION; SOMEWHERE ELSE AND ESPECIALLY NOT ON THE SAME ALT AS INCOMING TFC. MEASURE THE DISTANCE BTWN RWY 9L AND RWY 9R IN MIA AND LOOK AT EVEN THE PRM PROCS. THIS IS AN ACCIDENT WAITING TO HAPPEN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THAT IN THE PAST. HELI TA'S BY ATC HAVE BEEN AT 500 FT. THIS INCIDENT TOOK PLACE DURING A VERY HVY ARR/DEP TFC PERIOD. MIA SPECIALIST ADVISED THAT IT IS NOT UNCOMMON FOR SIGNIFICANT HELI OPS ALONG THE MIA EXPRESSWAY; APPROX 3 MI W OF MIA. BUT WITHOUT A SPECIFIC TIME AND DATE; HE COULD NOT PROVIDE DEFINITIVE INFO. ATC SHOULD BE KEEPING HELI TFC AT 500 FT. SOMETIMES; DUE TO AN ACCIDENT; AND MORE RECENTLY; DUE TO GRASS FIRES; THE SPECIALIST ADVISED THAT IT IS COMMON TO HAVE BTWN 5-8 HELIS IN THE VICINITY OF AN INCIDENT. IN ANY CASE; HE ADVISED; TA'S SHOULD ALWAYS BE GIVEN.