> > 2. do you have
> >         Option      "ZAxisMapping" "4 5"
> No.  Still can't use the scroll wheel.

My mistake, I should have been more clear: try *adding* that line.
It tells the X server to map the Z axis (wheel) of your mouse into
button-4 and button-5 events, which are what most wheel-aware apps
expect to see.

The line goes in the InputDevice section for your mouse.

-Chap