I'm no game programmer but it might not be that easy to allow support for 2 framerates in the same game,and I imagine it would require a lot of extra wizardy to work at all.Secondly there is the screen size issue,PAL50 is higher resolution than NTSC so if they were to just throw in an extra PAL60 mode just for the purists it wouldn't fit on the screen vertically (besides being too fast as well)