Erm, I don't think ANY PAL GAME HAS EVER had an NTSC mode. 60hz PAL yes, but not NTSC. ..?!?
It would be good if all next gen consoles could do what Debug (and presumably some modded) Xboxen can currently do, which is swap between ntsc/pal and resolution etc, as you please.
Running anything PAL in the US is a pain in the ass.