I used to be able to use Super+Mouse1 both to move a window and to raise the window on click. When I upgraded to 12.04 gnome-panel, it lost this functionality and I was forced to map F1 to raise a window. Now I am auditing Unity. I have disabled click-to-raise and auto-raise behavior as I would rather have control over which windows are raised when.
I am not aware of a way to map the mouse thusly, but I would be happy to hear that it is possible.