I tested it with Magical Tetris Challenge (PAL, as the game was never released in US), and it works perfectly.If you want to try, here is a experimental build with a "Force NTSC" option. It allows you to run PAL games at 60hz without any patches.
It seems to work alright.
![Thumbs up :thumbsup: đź‘Ť](https://cdnjs.cloudflare.com/ajax/libs/twemoji/14.0.2/72x72/1f44d.png)
The PAL version was poorly converted to 50Hz (from the JAP), making the game 17% slower.
I suppose it will for "native" 50Hz games (i.e. european games developped in 50Hz). Colin Mc Rae 2 is notorious for this, as the NTSC version is a crappy 60Hz conversion from the PAL version. Yeah, for once, the NTSC version is an inferior here. ^^Some games will run faster than intended.