more sensitive mouse pointer acceleration

Hi all, is there a way to fine-tune the mouse pointer acceleration under kde (or X)? I want a high acceleration (7-8x) so that I can move the pointer over the whole screen without moving my hand (fingers only). This makes fine navigation very hard because the transition from non-accelerated to accelerated moves is very abrupt. What would be great is if there were a third or even fourth acceleration level, e.g. Threshold Acceleration 0-3 1 4-7 4 8- 8 Is there anything available that provides such a feature? Regards Mario