The work needed to make a game run on PAL systems is insignificant compared with the time needed to translate the game to english. To make it even easier, they could just leave it running at 60 hz, and only change the signal type to PAL. Most TVs made the last 10 years can run at 60hz anyway. I know they did this with Wind Waker.

Ofcourse, the best thing would be to get rid of regional codings alltogether, and just set the video format on the fly, like PC games have done the last 20 years.