It turns out that Fedora 10 has an X that doesn't need an
$ xrandr --output VGA --left-of LVDS
xrandr: screen cannot be larger than 1280x1280 (desired size 2960x1024)
xorg.conf, and therefore doesn't have one, so it's hard to put in the fix for this, which is putting in a
Virtualline in the Screen.
This is what I had to put in
xorg.confto allow me to do dual head. Bear in mind that if you do this, then DRI will not work, and thus there will be no 3D acceleration.
And that was all that was needed. I can now use my external monitor via xrandr.
Virtual 2960 1050