Interesting that trying on an A1200 had no joy. That machine will switch quite happily between PAL and NTSC timing if you press the space bar at the boot menu.
The problem with running it in PAL mode is that it won't run at the correct speed (I assume). Most of the time when a game was converted to run on a PAL system, developers didn't adjust the game to take into consideration the slower framerate (50 Hz for PAL vs. 60 Hz for NTSC). This is very noticeable on action-based games like Sonic the Hedgehog, where if you are used to the NTSC version, playing the PAL version makes it feel like Sonic's feet are glued to the ground (not to mention how off the music sounds!).
Comparison video: https://www.youtube.com/watch?v=nSSYo0npMhA
(This is also probably not the sort of game where it's a big deal.)
http://www.lemonamiga.com/forum/viewtopic.php?p=129566&sid=d...