MD11 DEP FROM ONT EXPERIENCED TCAS RA WITH CARAVAN TFC ENTERING THE PATTERN.

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DEPARTED RWY 26L IN VISUAL CONDITIONS (ONT DEP ATIS AT XA53Z RPTED CALM; 4 SM HAZE CLR ALTIMETER 30.26). OFF GND AT XB11Z. WITHIN 1 MIN; TWR ADVISED US OF CARAVAN TFC AT 10 O'CLOCK POS AND ALSO ADVISED THE SAID TFC OF OUR POS; JUST HAVING DEPARTED THE RWY. THE CARAVAN RPTED US IN SIGHT AND WAS ADVISED BY ATC TO MAINTAIN VISUAL SEPARATION. ATC THEN ADVISED US OF THE CARAVAN'S VISUAL CONTACT OF US. WE STILL DID NOT HAVE THE TFC IN SIGHT. A FEW SECONDS LATER; I PICKED UP VISUAL TFC AT 10 O'CLOCK POS ABOVE US; BUT THEN REALIZED IT WAS A LARGER AIRLINE MORE DISTANT FROM US THAN THE CARAVAN. TCAS ISSUED AN ADVISORY TO REDUCE OUR CLB RATE TO LESS THAN 300 FPM AND SHOWED TFC 400 FT ABOVE US AND CONVERGING FROM 9:30 O'CLOCK POS. THE FO (PF) ADJUSTED CLB RATE ACCORDINGLY AND I SPOTTED THE CARAVAN OFF OUR L SIDE (9:30 O'CLOCK POS) IN WHAT APPEARED TO BE A CLBING R TURN. WE PASSED WITHIN 300 VERT FT AND 1/2 MI HORIZ. WE WERE THEN XFERRED TO DEP CTL AND AS WE SWITCHED FREQ; HEARD THE END OF A COMMENT FROM DEP CTL TO SOMEONE (ASSUMING IT WAS THE CARAVAN PLT) ABOUT THINKING IT WAS A LITTLE CLOSE BUT THAT FOR SOME REASON THE OTHER CTLR THOUGHT WE SHOULD JOIN UP 5 MI OFF THE RWY. WITH OUR TYPICAL SPD AND CLB RATE DEPARTING ARPT; I DON'T FEEL THE CTLR SHOULD HAVE CLRED US FOR DEP UNTIL THE ARRIVING TFC WAS CLR OF THE DEP PATH. IN CLRING US FOR TKOF; WHY DID HE BRING THE CARAVAN ACROSS THE DEP END OF THE RWY? I'M ASSUMING THE CARAVAN WAS BEING BROUGHT ACROSS THE EXTENDED RWY CTRLINE TO FLY A R DOWNWIND VISUAL APCH FOR RWY 26R. WOULDN'T IT HAVE BEEN BETTER TO BRING HIM OVER THE CTR OF THE FIELD; OR PARALLEL TO OUR RWY UNTIL HE COULD TURN HIM BEHIND OUR FLT PATH? EVEN WITH THE ASSISTANCE OF TCAS; IN THE HAZE I WASN'T ABLE TO PICK UP THE SMALL ACFT UNTIL HE WAS ABOUT 1 MI FROM US. ALSO; I REALLY DON'T APPRECIATE HAVING MY IFR SEPARATION DROPPED JUST BECAUSE THE CONFLICTING ACFT'S CREW RPTS OUR ACFT IN SIGHT. WHAT IF HE IS ACTUALLY SEEING ANOTHER ACFT INSTEAD OF US? (JUST AS I INITIALLY SPOTTED A MORE DISTANT ACFT THAN HIS). IN THIS CASE; THE CARAVAN PLT DIDN'T PROVIDE US WITH ENOUGH SEPARATION TO ENSURE OUR SAFETY. HIS ACFT'S MOVEMENTS AS WE GOT CLOSE INDICATED THAT HE MAY HAVE ALSO BEEN RESPONDING TO A TCAS RA AS WELL. NEXT TIME; I WOULD PREFER A DELAYED TKOF CLRNC UNTIL THE PATH IS CLR -- OR A RESTR ALT FOR US TO MAINTAIN THAT PROVIDES IFR SEPARATION UNLESS BOTH CONFLICTING ACFT'S CREWS HAVE ACKNOWLEDGED VISUAL CONTACT WITH EACH OTHER.