MEM DEP CTLR DESCRIBED NEAR CONFLICT WHEN DEP ACFT WERE ON WRONG FREQ AND ACCEPTED CONFLICTING TURNS; SUGGESTING CHART CHANGES.

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AT MEM WE HAVE A MULTITUDE OF ACFT CALLING DEP CTL ON THE INCORRECT FREQ. WE HAVE HAD AT LEAST 2 VERY CLOSE NMACS BECAUSE OF ACFT ON THE WRONG FREQ. TODAY I WAS WORKING THE E DEP POS AND I CALLED ACFT X; ISSUED A R TURN TO HDG OF 090 DEGS; AND A CLB TO 5000 FT. AN ACFT Y ANSWERED AND TOOK THE R TURN AND CLB FOR THE ACFT X. I DIDN'T SEE ACFT X TURN OR ANSWER AND JUST THEN THE W DEP CTLR CALLED OUT THAT ACFT Y WAS TURNING TO THE E. I CALLED ACFT Y AND TOLD HIM TO CLB TO 16000 FT. I SAW THAT ACFT Y WAS AT 4000 FT WHICH WAS 1000 FT ABOVE THE ACFT X. FAA MGMNT HAS DONE NOTHING BUT TO PUT OUT A DIRECTIVE FOR ONLY A COLDWATER DEP GATE TO BE ISSUED THE DEP FREQ BEFORE TKOF OR ON THE FREQ CHANGE TO DEP. HOWEVER; ESPECIALLY ACR ACFT WHO RECEIVE THEIR CLRNCS VIA PDC MAKE MANY MISTAKES DAILY BY CALLING THE WRONG FREQ. MGMNT WILL NOT HAVE THE SID CHART RETOOLED TO CORRECT THE PROB. THE SID MUST BE VERY CONFUSING. SEVERAL OF THE ACR'S HAVE CHARTS THAT INSTRUCT THE PLT TO USE A CERTAIN FREQ FOR A CERTAIN RWY. WE DO NOT ALWAYS TAKE ACFT TO SPECIFIC RWYS. WE MANY TIMES TAKE ACFT TO THE CLOSEST RWY OR TO ONLY 1 RWY BASED ON TFC; RWY CLOSURES; ETC. THE SID CHART MUST BE RETOOLED TO PREVENT A MIDAIR; BUT FAA MGMNT WILL NOT DO ANYTHING ABOUT IT. I HAVE ASKED AND HAVE BEEN TOLD THAT THE SID CHART WILL NOT BE CHANGED. GO FIGURE.