The Sega Dreamcast games usually allowed you to use 60Hz from the software's main menu, probably in response to half the Saturn users getting a 60Hz switch!
:-)
I think maybe all Amigas could be modded to switch between 50/60Hz PAL and 59.98Hz NTSC with a hardware dongle on the rear. This would be the best method for people in North America/Japan who wish to play PAL Amiga games.
That or getting a Philips/Commodore/Microvitec monitor. Although an LCD panel might be a good option to avoid the more flickery 50Hz PAL screenmodes... without needing to buy a less-than-perfect scandoubler/flickerfixer.