覆盖鼠标的速率设置。创建我自己的鼠标速率算法

I am working with disabled children, who have cerebral palsy. One child has limited fine motor control, so she currently uses a joystick to control the mouse, and it's traverse rate is set very low. This works well for her, as she can click all buttons on the screen, but I think we could do better - when she wants to traverse the whole screen it takes an age to do so (about 10 seconds).I am working with disabled children, who have c