Originally Posted by cycler
it's unclear to me how I can further divide up the three LCD's on the TH2G now.
Hmm, strange - I can see a more or less appropriate TwinViewXineramaInfoOverride in your xorg logs but not in the xorg.conf. Maybe it helps when adding the following line in the "Screen" section of your xorg.conf:
Option "TwinViewXineramaInfoOverride" "1280x1024+0+0, 1280x1024+1280+0, 1280x1024+2560+0, 2560x1600+640+1024"
However, since it seems that xorg already applied the option correctly, it makes we wonder why it is ignored, later.