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Hello,
I don’t think that’s possible right now… it is opensource code, so you can try to play with it and commit some enhancements if you want: https://github.com/gblazex/smoothscroll-for-websites/blob/master/SmoothScroll.js
Or just use some native JS or CSS to smooth scrolling if you are developing custom functionality. In CSS you can specify html, body{ scroll-behavior: smooth } or in JS with that scrollBy you’ve mentioned just use behavior: 'smooth', …but yes, it will feel a little bit different…