That's how I did it, was just making sure I wasn't missing thy he easy way.There's one method that comes to mind, but probably not the best way to do it. Go to Carbon Fibers, Buttons, turn the brightness of the backlight down all the way to zero, turn on custom actions, and set every action to none. Again, they should have added a "turn hardware buttons off" switch but seeing this is technically a pre-release rom, they might add it in before they actually release it.
Also, has anyone had the DSP manager crash when playing music through the Google play music app? I had to eventually uninstall it and flashed AudioFX from stock 33R instead.