ACR LTT TKOF WITH VISIBILITY REPORTED BELOW ARPT WX MINIMUMS FOR TKOF.

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AFTER TAXIING FOR TKOF AT MGM RWY 9; THE CAPT TOLD ME TO CALL FOR TKOF CLRNC. I CALLED THE TWR AND WAS ADVISED THAT THE RVR WAS 1200. THE CAPT TOLD ME TO TELL THE TWR AGAIN THAT WE WERE READY FOR TKOF. I TOLD THE CAPT THAT WE NEEDED 1600 OR 1/4 VISIBILITY BEFORE WE COULD TAKE OFF AND SHOWED HIM THE TKOF DATA PLATE WHICH INDICATED THE TKOF MINIMUMS FOR MGM. THE CAPT TOLD ME TO TELL THE TWR THAT WE WERE READY FOR TKOF. THE TWR CLRED US FOR TKOF AND REMINDED US THAT THE RVR FOR RWY 9 WAS 1200. WE TOOK OFF AND FLEW TO ATL. AFTER DEP THE CAPT STATED TO ME THAT OUR OPS MANUAL ALLOWED US TO USE A 1200 RVR REGARDLESS OF WHAT THE TKOF MINIMUM WAS. I REMINDED THE CAPT THAT WE HAD TO MEET CERTAIN CRITERIA BEFORE WE COULD REDUCE THE TKOF MINIMUMS; WHICH WE HAD NOT MET IN MGM. THE CAPT TOLD ME NOT TO WORRY ABOUT IT; THAT HE'D DONE IT BEFORE AND NO ONE WOULD SAY ANYTHING. WE SHOULD NOT HAVE DEPARTED NOR SHOULD THE TWR HAVE ISSUED A TKOF CLRNC UNLESS THE CAPT SATISFIED THE TWR THAT WE WERE ALLOWED TO REDUCE THE TKOF MINIMA. I SHOULD HAVE REFUSED TO TAKE OFF; AT THE RISK OF LOSING MY JOB. FORTUNATELY; NOTHING WENT WRONG ON TKOF; THIS TIME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: CALLBACK MADE TO ADVISE F/O TO TAKE THIS TO HIS PROFESSIONAL STANDARDS COMMITTEE. RPTR SAYS THIS AVENUE IS NOT AVAILABLE TO HIM. HE STATED HE HAS RESOLVED NEVER TO ALLOW A PIC TO INTIMIDATE HIM AGAIN AND WILL GET OFF THE FLT BEFORE HIS IS PARTY TO ANOTHER DELIBERATE FAA VIOLATION. INCIDENT WAS OBSERVED BY ANOTHER ACR WAITING AT THE BLOCKS FOR VISIBILITY TO IMPROVE AND AFTER TKOF BOTH THE ATC TWR LCL CTLR AND THIS OTHER FLT CREW COMMENTED ON THE CONDITIONS. RPTR THINKS FAA WILL INVESTIGATE.