One feature I really miss in X is dynamic mouse acceleration. It's simple really: When the user moves the mouse more slowly, the mouse acceleration should slightly be decreased, whereas when the user moves the mouse more quickly, it should be higher. This method of mouse handling acceleration makes the mouse a much more precise instrument I think. It's not to hard to implent and could be designed to be fully customizable by letting the user set some kind of increase/decrease-factor and an interval defining how often the mouse acceleration is actually being adjusted. Thanks in advance.