You can adjust the mouse move speed and number of increments in the settings, and see if you get something you like. But it will never get the same as the keyboard exactly, it would just get more "floaty" when it gets smoother. This is because the movement of your finger on the mouse wheel causes very intermediate input: every time the mouse wheel clicks, it's sending data to the computer, but between that there's no info sent. So instead of one continuous stream of keydown data as withthe keyboard, you get single events once or twice per second at most. We have options for smoothing between those events, but it winds up making it floaty.