Enable Wheel Mouse
To enable the scroll wheel on a wheel mouse add this line to your InputDevice Section in XF86Config:
Option “ZAxisMapping” “4 5”
How do I change the resolution in X?
You can change your resolution on the fly in X with the tool xrandr. This is a command line utility. You can do this in Gnome from the control panel.
KDE has a nice frontend called krandrtray. It can be used with most window managers, like fluxbox. krandrtray allows you to change Hz, resolution and control power saving features.
You can also change your resolution on the fly with ctrl + alt + + and ctrl + alt + -.