B737 CAPTAIN FLY'S 232 DEGREES TO 1900 FEET BEFORE TURNING TO HEADING ASSIGNED BY TOWER ON RDU7 SID.

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ACR FLT RDU-PHL. PDC CLRNC WAS CHANGED WITH CALL TO GND CTL FOR PUSH CLRNC. RDU7.RDU STILL APPLIED; BUT FIRST FIX WAS CHANGED TO TYI; ALONG WITH REST OF RTE TO PHL. RDU7.RDU OFF OF RWY 23L SAYS 'CLB HDG 232 DEGS TO 1900 FT.' WE INTREPID THAT TO MEAN NO TURNS BELOW 1900 FT MSL. WHEN TWR CLRED US FOR TKOF HE ISSUED A 210 DEG HDG. WE WAITED UNTIL 1900 FT MSL TO TURN. HE WANTED US TO TURN BEFORE THEN. WE WERE LATE CONTACTING DEP BECAUSE THE FREQ WAS CHANGED WITH THE NEW ROUTING. DEP ASKED IF WE HAD WAIT UNTIL 1900 FT TO TURN. WHEN WE ANSWERED YES; HE GAVE US A PHONE NUMBER TO CALL. IN PHL; I CALLED THE SUPVR; WHO EXPLAINED THAT HE WAS NOT SATISFIED WITH HOW THE SID WAS WORDED; AND THAT ABOUT 90% OF THE ACR'S WAIT UNTIL 1900 FT TO TURN. HE SAID IN IMC CONDITIONS IT COULD CREATE SEPARATION PROBS WITH DEPS OFF THE PARALLEL RWY 23R. MY RECOMMENDATION; UNTIL THE WORDING OF THE SID IS CHANGED; IS FOR THE TWR CTLR TO ISSUE CLRNCS WITH 2 SEPARATE XMISSIONS. FIRST; 'RWY 23L; CLRED FOR TKOF.' THEN; AT 400-500 AFE; 'TURN L HDG 210; CONTACT DEP.