Since the built-in trackpoint comes through as a PS/2 mouse, I use gpm in repeater mode. I tell it to listen to both /dev/psaux and /dev/usb/mice (old kernel). I then tell X to use /dev/gpmdata. I can then use 15 USB mice and the trackpoint. (of course you know I have 15 arms, trackpoint is done with my nose.) :) -- END OF LINE