I solved a similar problem (module not loading) by adding the modprobe...
command to a boot script. In SuSE the appropriate script is /etc/init.d/boot.local, but this thread
suggests that the equivalent script is /etc/rc.local in Slackware.
Use a text editor to add the line to the script, and it should load at boot.
Sorry, I don't know the answer to the mouse question.