A much easier option is to use labels and perl to swap comment items around
in the nginx.conf file.
#PLABEL
#development line....;
production line....;
if readln eq '^#PLABEL' then { swap 2 lines comment char; } else { write
unchangedline; }
Or something in that order.
Posted at Nginx Forum: http://forum.nginx.org/read.php?2,256733,256734#msg-256734