gnome-display-properties, RandR, apply to all users / logon screen?

[Alexander List]

Hi,

I wonder if it's possible to apply the monitor settings done in 
gnome-display-properties to the login screen resp. all users on a 
workstation...

My problem: I have an Nvidia Quadro FX 1700, use the nouveau driver and 
would like to rotate the two Dell 24" screens on my desk. X11 correctly 
detects that I have two screens, but it cannot detect that I've turned 
them clockwise...

I've tried to tweak xorg.conf after Googling for two hours and gave up...

The only hint I found was

http://live.gnome.org/RandR - that's about as close as I could get to a 
solution... is there a way to apply the monitors.xml created in ~/.conf 
to the entire system?

Alex