using mouse wheel

[Wojciech Puchar]

i just bought some cheap PS/2 mouse (A4 tech) 3-keys while middle key is a 
wheel that can be both pressed and rolled


no rolling works both in text and xorg

moused_enable="YES"

in rc.conf

and

Section "InputDevice"
         Identifier  "Mouse0"
         Driver      "mouse"
         Option      "Protocol" "auto"
         Option      "Device" "/dev/sysmouse"
         Option      "ZAxisMapping" "4 5 6 7"
EndSection


in xorg.conf

do i have to add something?

my friend uses USB mouse and scrolling works as is.