MEM LCL CTLR DESCRIBED INCIDENT DURING MULTIPLE RWY OPS AND QUESTIONS FAC'S COMPLIANCE WITH FAA ORDERS AS WELL AS EXISTENCE OF OPS WAIVER.

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3RD ACFT INVOLVED-- ACR Z/DC9; DEPARTING RWY 18R; IFR. ACR X WAS LNDG RWY 27 WORKING WITH LC3 (RWY 27 LCL). I WAS WORKING LC1 (W LCL) WITH ACR Z IN POS RWY 18R AND ACR Y ON A 3.5 MI FINAL FOR RWY 18R. DUE TO TFC THAT WAS UNABLE TO COMPLETE A XING OF RWY 27; THE LC3 CTLR SENT ACR X AROUND. LC1 CTLR ISSUED A 230 DEG HDG TO ACR X BECAUSE OF TFC LNDG ON RWY 18L AND RWY 18R. I HAD CLRED ACR Z FOR TKOF WITH A HDG OF 180 DEGS AND IMMEDIATELY ISSUED ACR Y TFC FOR THE GAR. ACR Y SAID HE HAD THE CRJ IN SIGHT AND CONTINUED INBOUND FOR LNDG. I ADVISED LC3 OF MY DEPARTING TFC AND HE INSTRUCTED ACR X TO FLY HDG 160 DEGS. WHEN ACR Z WAS AIRBORNE; I ISSUED A TURN TO 210 DEGS TO ENSURE SEPARATION. THANKS TO CTLR COORD AND PLT AWARENESS; THE SITUATION PROGRESSED WITHOUT INCIDENT. ANOTHER KEY WAS ACR X BEING SENT AROUND AT A 1 1/2 MI FINAL. IF ACR X HAD GONE AROUND ON SHORT FINAL; A TURN AWAY FROM TFC LNDG RWY 18L AND RWY 18R MAY NOT HAVE BEEN FEASIBLE; PUTTING ACR X IN DIRECT CONFLICT WITH ACR Y AND/OR ACR Y WAKE TURB. I HAVE WORKED AT 2 OTHER ARPTS WITH SIMILAR TO MEM AND AT BOTH IT WAS NOT PERMISSIBLE TO LAND RWY 18 OVER ACFT LNDG RWY 27. I AM NOT AWARE OF ANYTHING IN FAAO 7110.65R THAT ALLOWS THIS OP. MEM MGMNT HAS MENTIONED THAT WE HAVE A WAIVER FOR THIS OP; BUT WILL NOT PROVIDE THE WAIVER WHEN REQUESTED. MEM MGMNT HAS ALSO SAID THAT FLT STANDARDS HAS APPROVED THIS OP; BUT WILL PROVIDE NO SPECIFIC POINT OF CONTACT OR DOCUMENTATION TO VERIFY. I BELIEVE THIS OP PUTS CTLRS AND PLTS IN A VERY PRECARIOUS SITUATION.