I consider it a feature. It might be better if right-clicking used the distance from the end instead of from the beginning as the amount to move (so that the clicked position would then be on the bottom of the screen, like left-clicking scrolls the clicked position to the top of the screen) (but also, maybe it isn't better that way), but it is still better than Microsoft scrollbars I think. I use all three clicks on it, and I think it isn't inconvenient; it is good.