I'm leveraging a negative number from .scrollY that you can get on mobile from over scrolling. Is there a way to achieve this effect on desktop?
It depends on the input device. If you're using a Magic Mouse, Magic Trackpad or a MacBook's trackpad, you should get kinetic overscrolling,
That's odd -- I'm not getting it on my trackpad or Magic Mouse, only on my phone.
I'm traveling without my Mac right now and I can't check, but, as far as I remember, I used to get kinetic overscrolling in the latest version of Framer Studio. I might be wrong though.