For some reason I have not been able to get the mapping to function correctly by configuring the keys using the built-in modifier. Also, every other person that I can find asking the question was using their Windows as the server and trying to do it opposite from what I'm wanting, so I couldn't find a definitive case of some accomplishing what I need.
I'm using a mac keyboard, with mac 10.6.8 as the server connected via synergy to client Windows 7. I would like to be able to copy-paste and such on my windows using my command key instead of having to switch back to ctrl-c. Perhaps I'm just a bit confused with the meta, super, etc. words synergy uses, but I've tried several configurations and nothing seems to change they keyboard function at all. Is there a trick to make it work?