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Extended desktop at the login screen in ubuntu

I have an ATI Raden dual head at my desktop here at my job. I like to use WindowMaker as my window manager of choice, but since I had upgraded to Ubuntu 10.04 Lucid, WindowMaker is showing some issues regarding the dual monitor setup. WindowMaker follows the login screen (GDM) monitor setup and when I launch a gnome-session, things get messed up.

The first solution which came to my mind is to make gdm aware of the two monitors.

"Googling" around I've found two usefull links:

Following the first section of the first link ("Extended desktop through both monitors") I've wrote my new xorg.conf file:
Section "Monitor"
 Identifier      "monitor0"
EndSection

Section "Monitor"
 Identifier      "monitor1"
 Option          "RightOf" "monitor0"
EndSection

Section "Device"
 Identifier      "card0"
 Driver          "radeon"                     ### EDIT ###
 Option          "Monitor-DVI-0" "monitor0"   ### EDIT ###
 Option          "Monitor-DVI-1" "monitor1"   ### EDIT ###
EndSection

Section "Screen"
 Identifier      "screen0"
 Device          "card0"
 Monitor         "monitor0"
 DefaultDepth    24
 SubSection "Display"
         Depth   24
         Virtual 1280 1024                   ### EDIT ###
 EndSubSection
EndSection

Section "ServerLayout"
 Identifier      "default"
 Screen          "screen0"
EndSection

And everything worked just fine.
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