[ubuntu] Having two different mouse devices at the same time

view story

http://ubuntuforums.org – On my desktop, I've got an IBM model M keyboard with a trackpoint built into it (attached via the PS2 mouse port). I also have a wireless USB mouse. My problem is that the mouse settings required for each are different. Basically, if I set up my mouse speed and sensitivity so that the trackpoint work properly, then my USB mouse is too fast. If I set it up for the USB mouse, the trackpoint is so slow as to be unusable. I was wondering if there was some way to set up my mouse settings such that a different speed/sensitivity would be used by the PS2 mouse (trackpoint) and the USB mouse. (Hardware)