This is something that would make me very happy as scrolling through 17K photos, even with smart previews created, it lags very badly. Even though I have vertical sync turned on, I can see screen tearing.
This is valuable for me as both the macOS and the Windows version of LR Classic struggles with it.
This doesn't seem to be much of a problem with LR (cloud-based) so, maybe, you could integrate the same scrooling technology into the classic version, and make it cusomizable, of course.
In summary, I'd love to see smooth scrolling in action, but the culprit is the lag between scrolling on the mouse and watching the change happen 3 seconds later, which creates a very jarring experience on a 4K monitor.