Currently on my machine I can switch through desktops by hitting "Option + Arrow Left/Right." This is a holdover from my prefs in Lion, I believe. BUT, I cannot for the life of me, figure out where I can change this setting to say, "Control + Arrow Left/Right." I need to be able to use "Option Arrows" for After Effects and nudging keyframes. Where can I change this? It's insane I can't find this right now.