I am using Synergy-plus-1.3.4 on Gentoo Linux kernel 2.6.36-tuxonice-r3.
I am using SHIFT+CAPS to change the keyboard layout on BOTH server and client boxes. It works perfectly if I change the layout using attached keyboard. But, when using the Synergy keyboard (I move the mouse from the server screen to the client and change with SHIFT+CAPS) it has no effect.