OPDEV PLTDEV INVOLVING AN ACR AND A UGA.

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ON A VISUAL APCH TO SBA; I MONITORED APCH FREQ WHILE THE FO OBTAINED ATIS. HE MADE NO MENTION TO ME OF ANY INTERSECTING RWY OPS; NOR WAS SUCH INFO (EVIDENTLY) BROADCAST ON ATIS. AFTER THE HDOF; TWR CLRED ME TO LAND RWY 25; BEHIND PRECEDING COMMUTER. I ADVISED THE FO TO COMMUNICATE THAT THE AIRPLANE AHEAD OF US FOR LNDG RWY 25 WAS IN SIGHT; AND I THEN BEGAN ABOUT A 3 MI LEG TO THE THRESHOLD. VREF WAS PARTICULARLY LOW FOR THIS APCH DUE TO LOW FUEL AND PAX LOAD; SO I MADE AN ATTEMPT TO EXIT RWY 25 ON WHICHEVER PARALLEL INTERSECTING RWYS (15/33R&L) WAS PRACTICAL; RATHER THAN ROLL TO NEARLY FULL LENGTH ON RWY 25. MY RECOLLECTION IS THAT ALMOST IMMEDIATELY AFTER FULLY TOUCHING DOWN; THE TWR ATTEMPTED TO ADVISE US TO EXIT ON ONE OF THE 2 RWYS OR ROLL THROUGH THE INTXNS. HOWEVER; DUE TO THE NOISE GENERATED BY HIGH RPM REVERSE THRUST SETTINGS; THE COM WAS NOT FULLY 'HEARABLE.' I THEN BEGAN TO LEAVE THE RWY 25 CTRLINE FOR A RWY 15R EXIT (A L TURN IN THIS CASE). THEN TWR ISSUED A GAR CLRNC; VIRTUALLY COINCIDENTALLY WITH THE FO CALLING TO MY ATTN (DURING A NORMAL; BY NOW REFLEXIVE INTXN CHK) THAT 'WE HAD' A PLANE ON VERY SHORT FINAL RWY 15R. BY THE TIME THE TWR HAD FINISHED ITS XMISSION TO THE OTHER ACFT; I HAD STOPPED DEAD IN MY TRACKS; WITH MY NOSEWHEEL SOMEWHERE AROUND 4 FT FROM THE RWY 15R EDGE STRIPE. THE GAR THAT ENSUED TOOK PLACE DIRECTLY TOWARD US; WHICH IF NOTHING ELSE; MUST HAVE DISTURBED THE PAX ON BOARD MY PLANE AT LEAST HALF AS MUCH AS IT DID MYSELF AND THE FO. THE TWR THEN ADVISED THAT IT HAD SAID 'EXIT RWY 15L OR ROLL THROUGH INTXN.' THE DISTINCTION IS NOT LOST ON ME; BUT WHERE IS THE LOGIC IN: 1) WORKING MULTIPLE ACFT ON RWYS OF SUCH CLOSE PROX IN CONFLICTING PATTERNS; AND 2) WHY; WHEN THE TWR HAD HAD THE MEANS TO COMMUNICATE THEIR INTENTIONS WITH REGARD TO WORKING THE ARRS INTO INTERSECTING RWYS; DID THEY WAIT UNTIL WHAT REALLY WAS THE WORST POSSIBLE MOMENT TO COMMUNICATE THAT INTENT? WE (BOTH ACFT) MUST HAVE BOTH BEEN ON SHORT FINAL AT THE SAME TIME; AND THE TWR SHOULD HAVE SEEN THIS ONE COMING LONG BEFORE I DID! WE TAXIED TO THE GATE WITHOUT FURTHER INCIDENT.