ON ATAP 1 ARR TO SKRG UNDER SKMD APCH CTL; B757 FLT CREW EXECUTE A TCAS LEVELOFF DUE TO A CONFLICT WITH ANOTHER INBND FOREIGN ACR ON THE MEDAL 1 ARR.

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ARRIVING OVER SKRG WITH QUALIFYING CAPT; WE WERE CLEARED TO 12000 FT AND CLEARED FOR THE ATAPE 1 ARR WITH APCH TO RWY 36. WE TEACH TO CROSS RNG VOR AT 180 KTS AND FLAPS 5. CAPT HAD THE AIRPLANE ON SPEED AND ALT. THE ARR ASKS FOR OUTBOUND LEG OF 215 DEGS AND CROSS 7 DME AT OR ABOVE 11000 FT. AS WE WERE APCHING THE VOR; WE SAW ANOTHER ACFT PASSING BELOW US. WE HEARD THE CTLR AND ACFT CREW SPEAKING IN SPANISH. FROM MY EXPERIENCE AT SKRG; I BELIEVED THAT THE OTHER ACFT WAS CLEARED THE MEDAL 1 ARR. WE PROCEEDED AS CLEARED DSNDING TO 11000 FT OUTBOUND ON THE 215 DEG RADIAL. WE BECAME AWARE THAT THE OTHER ACFT HAD TURNED INBOUND AND WAS HEADED AT US FOR THEIR INTERCEPT OF THE LOCALIZER FOR RWY 36. THE LIGHTS OF THE ACFT GOT OUR COMPLETE AND UNDIVIDED ATTENTION. WE THEN GOT A TRAFFIC ADVISORY FROM TCAS. THE CTLR STARTED CALLING US IN AN EXCITED VOICE AND REQUESTING US TO MAINTAIN OUR ALT. WE DID. WE WERE NOT GOING TO DSND TO 10000 FT UNTIL INBOUND ON THE 180 DEG RADIAL. THE OTHER ACFT PASSED BEHIND US AND CONTINUED INBOUND NOW ON THE LOC FOR 36. WE WERE CLEARED FOR THE ILS 36. WE LANDED WITH AMPLE SEPARATION ON LNDG. THIS ARR IS REALLY TOO TIGHT WITH OTHER ACFT AS IT IS CONFIGURED NOW. SKMD APCH CANNOT ISSUE VECTORS AND THEY CHOSE NOT TO GIVE US A TURN IN HOLD AT ALEJA FOR SEPARATION. THIS ARR REALLY NEEDS SOME REDESIGN TO BE USED BY MULTIPLE ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THAT COMPANY POLICY FOR LNDG SKRG IS TO BE AT 180 KTS; AT 12000 FT OVER RNG VOR INBND WHEN EXECUTING THE ATAPE 1 ARR. RPTR STATED THAT FOREIGN ACR'S PLAN THEIR SPD OVER RNG AT 250 KTS. RPTR STATED THAT HE WAS AWARE OF OTHER FOREIGN ACRS ARR ON APCH FREQ AND BELIEVES THAT THE CTLR JUST DIDN'T PLAN/CALCULATE FOR THE OTHER ACR'S OVERTAKE DUE TO THEIR SPD DIFFERENTIAL; AND WAS APPARENTLY STARTLED; SEEING THE CONFLICT ABOUT THE SAME TIME THE RPTR RECEIVED THE TCAS TA ALERT.