OK i can force my monitor to run custom resolutions in windows just fine. I can have it run in 16 x 12 and have 2 black side bars. I want games to do this too, but it seems they realize m monitor ...
I think when you connect your PB to your TV using DVI/HDMI it will detect the resolution of the connected (HD)TV. If you choose not to mirror the content of the mainscreen you should be able to select ...