I want to find something to smooth my mouse input, i want to make little cinematics in old games like gta sanandreas, but i dont want the camera rotation looking choppy. i tried searching the net, but all i could find is how to remove mouse acceleration and that sort of stuff. sorry if the wrong section.
Lower the DPI of your mouse, remove mouse acceleration, and careful mouse control (learn how to move it with your arm, not with your wrist)
Having a big ass mouse pad helps too, as you will want lots of space for the mouse to go so you don't have to pick it up.
I don't know if there is anything software wise - but here is something i ran across the other day that could help with what you want to do. http://amzn.com/B000LB7G00
Seems like your movements could be smoother and more precise with the 3d mouse - it acts like a big joystick of sorts. Although, disclaimer, I do not own nor have i ever tried this product, I just thought it looked cool and may work for ya.