I use Actual Multiple Monitors to do the same thing. I've got a 40" landscape display that I use for both an arcade cab and virtual pinball. The only downside to this sort of mirrored setup versus the freecam mod is that you get two copies of the DMD - one on your main display and another on the 2nd screen. It's a bummer, since the simple fix would be if Farsight would ever simply support positioning of the backglass and DMD directly in their app. I have my doubts this will ever happen due to licensing concerns from virtual pinball cabinet manufacturers.