Editor game view on second monitor?

I doubt that this will work, but you can try to maximize the game window on the second screen by right clicking the name of the tab (in this case, game in the top left corner) and hitting maximize. I am fairly certain this will just maximize it inside of the main unity window though, but it's worth a try. That's the only think I can think of to try though.

If you drag the game window onto the Rift and then click the little rectangle button (to the left of the "x" on the top right) then it will maximize on the Rift. It still won't technically be "full-screen" but it should be good enough for a preview.

If you are on Windows 7 you can add the "-Adapter N" parameter (where N is the monitor number) to an exe shortcut and that will launch it on the Rift. So you would build the exe, and then run the shortcut. Still a little hassle but much easier then switching the Rift to primary monitor every time.