Yes, the trackpad is always scrolling as if Natural Scrolling was disabled in the Event Graph, Behaviour Tree, and Material editor, haven’t tested all the editors though. The World Outliner and the rest of the UI elements seems to be scrolling OK, with the Natural Scrolling option changing the direction of scrolling as expected. The Unreal Engine is version string is: 4.9.2-2707645+++depot+UE4-Releases+4.9 running on OS X El Capitan.