Well I definately don't see such a util on my Amiga. It might be possible though. Take Fury of the furries. When you booted that you had the option to play in 50hz mode or 60 hz mode. The game would be faster in 60hz too.
I always thought NTSC was 60hz and pal was 50hz and that pal couldn't run 60hz. Gues sI was wrong.