RPTR ENCOUNTERS WAKE TURB FROM BOEING 757.

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WE WERE DSNDING ON THE ARR WHEN I NOTICED TFC IN A DSNDING R TURN IN FRONT OF US JOINING THE SAME ARR. WHEN CTR DIDN'T MENTION TFC FOR US I CALLED AND ASKED IF THERE WAS TFC AT 12 O'CLOCK FOR US. CTR ADVISED TFC AHEAD B757 4 1/2 MI. TFC DISAPPEARED BELOW A CLOUD LAYER FOR 2-3 MINS. WITHIN 5 MINS AFTER SPOTTING TFC WE HIT HIS WAKE. HE HAD DISAPPEARED BELOW THE CLOUD LAYER AND WE WERE STILL 500-800 FT ABOVE CLOUD LAYER. OUR ACFT WAS ROLLED INTO A 35-45 DEG BANK. CAPT RECOVERED BY DISCONNECTING AUTOPLT; FULL R RUDDER; AND ADDING FULL PWR. PNF THEN CALLED ATC TO ADVISE CLBING DUE TO WAKE TURB ENCOUNTER. I BELIEVE THERE IS AN ONGOING STUDY ABOUT THE B757 AND WHETHER IT SHOULD BE CLASSIFIED AS A HVY CATEGORY ACFT. MY FEELING IS THAT IT SHOULD. THIS IS MY THIRD ENCOUNTER WITH A B757 WAKE IN THE LAST 3 YRS. THE FIRST 2 TIMES WERE CLOSER TO THE LNDG ARPT (2-5 MI) AND ACFT WAS ROLLED PAST 45 DEG OF BANK. SUGGESTIONS: 1) WHY COULDN'T THERE BE PARALLEL ARRS; ONE FOR HVY OR LARGE ACFT AND ONE FOR SMALLER. DENVER HAS PARALLEL STAR'S AND WHY COULDN'T THEY USE THEM THAT WAY; 2) CTLRS COULD BE MORE AWARE OF THE ACFT AND THE VECTORS GIVEN. I HAVE OFTEN HAD A DC10 RUN OVER THE TOP OF ME 1000-2000 FT ABOVE OR VECTOR BEHIND A HVY AND HAD TO ASK FOR A STAGGER TO TRAIL A LARGER ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE WAS FLYING AN EMB120/RT. THIS RPTR HAS HAD 2 OTHER ENCOUNTERS AND ALL WERE B757 GENERATED WAKE. THE 2 PAST EXPERIENCES WERE ON SHORT FINAL. THIS ENCOUNTER AT ALT WAS AS ALARMING AS THE PAST 2 ENCOUNTERS ON SHORT FINAL DUE TO THE ABRUPTNESS. THE PRACTICE OF OVERFLYING HVY'S AND THEN DSNDING THE HVY THROUGH THE ALT JUST IN FRONT OF THE COMMUTER WHEN THE COMMUTER PLT RESPONDS HE HAS THE HVY IN SIGHT HAS BEEN A REPEATED COMPLAINT.