Hi Eelco, thanks for your nice words 🙂
Dirty/easy way: find the code block where there are some instances of (‘html, body’).animate and completely remove it. You will need to do this over your Muse exported .html files.
Elegant/hard way: you should be able to add some custom jQuery code inside Muse that overrides that scrolling instructions. That would allow you fix it directly in Muse.
I hope it helps!