I have an issue with my thinkpad’s buttons above the touchpad (the pointer device below keyboard). The issue is that pressing the mouse_button_modifier key (Alt) + middle button + mouse movements starts scrolling events instead of window resize events.
The default settings work just fine if I plug in an external pointer device, but the touchpad is “misbehaving” and one way to cope with this when there’s no external keyboard or mouse, is to set the gconf key /apps/metacity/general/resize_with_right_button to true.