Use a wheel mouse in FreeBSD 5.3

Tested on FreeBSD 5.3
First install imwheel from /usr/ports/x11/imwheel
# cd /usr/ports/x11/imwheel
# make install clean

Start imwheel on boot, any method you prefer… I do,
in /usr/local/etc/rc.d/X.sh
#!/bin/sh
/usr/X11R6/bin/imwheel &
/usr/X11R6/bin/xdm &

Now edit your xorg.conf file
# vi /etc/x11/xorg.conf

Under:
Section “InputDevice”
Identifier “Mouse0″
add Option “ZAxisMapping” “4 5″

Disable 3 button mouse emulation in xorg.conf
comment out any
# Option “Emulate3Buttons”
# Option “Emulate3Timeout” “50″

Disable emulation in rc.conf
comment out
#mouse_flags=”-3″

Now restart X and you should be good to go.