HANDLING OF COMMUTER AND ACR ACFT FOR PARALLEL RWY VISUAL APCHS.

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CAVU IN DEN; BEING VECTORED FOR VISUAL APCH TO RWY 25 AT DEN. A B737 BEING VECTORED FOR RWY 26R AND ANOTHER UNKNOWN ACFT FOR RWY 26L. ARRIVING ON DEN VOR 046 DEG RADIAL. APPROX 20 NM FROM ARPT GIVEN HDG 190 DEGS TO INTERCEPT FINAL APCH COURSE; TOLD TO DSND FROM 11000 FT TO 9000 FT. ADVISED OF B737 TFC PASSING ABOVE AND TO OUR R. I WAS PNF; FO FLYING ACFT. APPROX 10 NM FROM ARPT ADVISED ATC ARPT IN SIGHT AND SUBSEQUENTLY CLRED FOR VISUAL TO RWY 25. THE B737 HIGH ABOVE US SBOUND GOING TO RWY 26R AND HAVING DIFFICULTY SPOTTING OTHER TFC AND CONFUSION WITH APCH CTL AS TO THEIR CLRNC FOR A VISUAL APCH TO RWY 26R. B737 ADVISES RECEIVING TCASII WARNINGS. WE TURN WBOUND FOR RWY 25 THE SAME TIME THE B737 FINALLY CLARIFIES CLRNC FOR VISUAL RWY 26R. AS WE TURN R B737 TURNS R AND DSNDS FOR RWY 26R. WE WERE TO FOLLOW BUT MY NEW HIRE FO IS SLOW TO REDUCE TO APCH SPD AND SAID HE WAS CONFUSED AS TO B737 INTENTIONS. VERY QUICKLY WE CAUGHT B737 AND WERE DIRECTLY UNDERNEATH B737; NOW WITH SPDS MATCHED. I ESTIMATE 800 FT OF SEPARATION. THE B737 ADVISED OF TCASII WARNINGS. APCH CTL ADVISED B737 THAT WE (ME) HAD THEM IN SIGHT. I INSTRUCTED MY FO TO TURN TO A NW HDG AND SLOW DOWN. I ADVISED APCH CTL AGAIN THAT WE HAD THE B737 IN SIGHT AND THAT WE WERE TURNING; SLOWING; AND DSNDING. AS WE DID; THE B737 MOVED L TO ALIGN WITH RWY 26R AND WE MANEUVERED BACK TO RWY 25 AND LANDED WITH NO FURTHER PROBS. IT SEEMS TO BE VERY COMMON WHEN DEN IS USING RWY 26L; RWY 26R; AND RWY 25 FOR VISUAL APCHS THAT TURBOPROPS ARE TURNED FOR A LONGER AND LOWER ALT FINAL APCH AND JETS; ESPECIALLY ARRS FROM THE W; ARE KEPT HIGHER AND TURNED ON TO SHORTER FINALS. WHILE THIS MAY SAVE FUEL; IT ALWAYS CAUSES CONFLICT BECAUSE THE TURBOPROPS ALWAYS FLY A FASTER FINAL APCH. CTLRS DON'T SEEM TO REALIZE HOW FAST A TURBOPROP CAN SLOW DOWN. AS A RESULT TURBOPROP CREWS ARE ALWAYS 'RUNNING UP' ON THE JETS IN THE LAST 6 MI. TURBOPROPS CAN ALSO MORE EASILY MAKE A STEEP AND YET FAST DSCNT WITHOUT PROBS. TO MAKE THE DEN PROCS SAFER IT WOULD SEEM BEST TO PUT THE TURBOPROPS ON THE HIGH SHORT FINAL AND THE JETS ON THE LONG FINAL; ALLOWING THEM MORE TIME TO SLOW AND DSND.