Hey everybody ,
Well I wanted to make a little tool to quickly mirror control rig of my biped and well i end up with something working but maybe a bit messy code tho
Sorry this stuff is quite new to me and optimisation sound like alien sound to me 
I am doing game animation the most so i guess that will be usefull for some of you
I add lot of comment in the VB script so I guess you can figure out things, I will try to improve that with a GUI maybe and add some other functionality maybe like do same for a whole pose etc…
Feel free to ask if you get stuck or something doesnt work , as i didn’t check every configuration
here is a little video of how that work >>
http://www.karbongaming.com/temp/mKey/mKey.htm
hope that helps 