Unless I'm mistaken, newer mouse drivers explictly reserve buttons 4, 5, 6, and 7 for scrolling functions, so we should be able to safely assume that they do what we expect. (I don't actually own a mouse with more that 3 buttons + a wheel, but that don't have a horizontal scroll, so I can't test this)
Unless I'm mistaken, newer mouse drivers explictly reserve buttons 4, 5, 6, and 7 for scrolling functions, so we should be able to safely assume that they do what we expect. (I don't actually own a mouse with more that 3 buttons + a wheel, but that don't have a horizontal scroll, so I can't test this)