Hello again :),
Thanks for the additional info. I will fix this in the upcoming 9.3 release.
Regarding "jitters", could you send me some example page where I could try to reproduce it? You can send it to my support email or create new issue here:
https://github.com/fastaddons/ScrollAnywhere/issues

But if the scrolling starts inside "iframe", like some "ad banner", it may cause performance issues, for that it's best to use some adblock, like "ublock origin".

Thanks!