3.0 Client - Set default desktop layout to Full Screen, not All Monitors

In the 3.0 client it appears the default display layout is 'All Monitors'. I can set 'FullScreen' through the 'desktopLayout' switch but, when I do that, all other options are grayed out. I would like to be able to set 'Full Screen' as the default option but, allow users to select 'All monitors' if they would like to do so.

In the 5.4 client 'Full Screen' is the default layout.

Any help would be great!

Thanks