In 2011 I used to be able to toggle off red selected faces in the viewport by hitting F2, but since moving to 2012 this is now set up to turn on hidden line shading mode. It was very useful to see through the selected faces for doing quick slices. I'm not even sure what the old command I used was called, so I can't switch the hotkey back, any ideas?
Edit: and I've also changed office so I can't check my old setup
