DISPATCHER QUESTIONS THE DECISION OF THE PIC OF A TURN BACK DURING A NIGHT OP RETURN LAND TO ATL OF A B767-300 AFTER AN INFLT ENG SHUTDOWN NEAR GSO; NC.

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B767-300 FLT CREW ADVISED OIL QUANTITY AND OIL PRESSURE WERE DECREASING. FLT WAS APPROX ABEAM GSO. CAPT WAS ADVISED BY MAINT COORDINATOR TO NOT SHUT ENG DOWN UNLESS LOW PRESSURE LIGHT ILLUMINATED -- CONSISTENT WITH COMPANY PROCS. FLT COORDINATED WITH ATC TO RETURN TO ATL. AFTER INITIAL CALL ADVISING OF OIL PRESSURE AND QUANTITY GOING DOWN; I CHKED CONDITIONS; NOTAMS; ETC; AT ARPTS BTWN ACFT'S POS AND ATL; IN THE EVENT ENG SHUTDOWN BECAME NECESSARY. 20 MINS LATER; CAPT CALLED TO ADVISE THAT L ENG OIL PRESSURE LOW LIGHT HAD ILLUMINATED; AND HE WAS GOING TO SHUT THE L ENG; RESULTING IN AN EMER SIT; AND THE CAPT STATING HE WAS PROCEEDING TO ATL; EXERCISING HIS EMER AUTH. I DID NOT THINK IT PRUDENT AT THAT POINT TO BE OFFERING OTHER OPTIONS FOR LNDG LOCATIONS; AS THE CREW WAS BUSY FLYING AN ACFT WITH 1 ENG OUT; AND I DID NOT WANT TO QUESTION THE CAPT'S AUTH OR KNOWLEDGE OF THE FAR'S BY RECITING THE REQUIREMENT TO LAND AT THE NEAREST SUITABLE ARPT. I CONTINUED TO MONITOR THE FLT'S PROGRESS BACK TO ATL; AS WELL AS CONDITIONS AT SEVERAL OTHER ARPTS IN THE EVENT THAT IT WAS NECESSARY TO FIND AN ALTERNATE FOR ATL.