Is there any way to patch this to the PAL release?
playing american 60hz SMW on pal 50hz console gets weird lag, I would like to make a PAL repro of the game.

I've never worked with PAL stuff, sorry. Is Euro SMW even PAL format? If not, maybe someone has hacked SMW to PAL before. You could try applying such a patch to SML3.

Thanks so much for releasing the rom! It looks great and I can't wait to try it. Cheers!