Setting mouseWheelSensitivity
to 20000
seems to have restored the ability to scroll the hotbar with my Logitech G500 on macOS 10.13.6. Creative inventory, however, is completely unusable. Scrolling any of the pages causes the window to go from whatever position it's currently at to the very bottom (or very top if I scroll up).
I don't know if this is related or not, but I cannot scroll while holding shift.