iirc there are some hacks for PAL games to change the speed (50 vs 60 fps). This is always possible, but it's very hard (read: impossible) without the game source to change the framerate and to retain the ingame speed.
btw: dolphin supports to run the game slower without audio stuttering, but it sounds funny
btw: dolphin supports to run the game slower without audio stuttering, but it sounds funny
