Very few GUI tools cannot be navigated using tab, space, Enter and alt+up/down. You didn't say which distro you're using so I can't check if it will work with yours.
However, the basic configuration (for X at least) is held in /etc/X11/XF86.conf or XOrg.conf. You need to specify the pointer device to the appropriate device; usually /dev/mouse is set up as a symbolic link to the mouse that you actually have.
You might get away with just changing /dev/mouse to point to /dev/psaux:
Code:
cd /dev
su -c 'rm -f mouse; cp -s mouse psaux'