Different aspect ratio Monitors with Presentation Manager

[michaelrandall2009]

I'm using two external monitors via a docking station with my T61p. One is connected as VGA and the other Digital (HDI) and use Presentation Manager to extend my desktop in a 1, 2 setup. I cannot find any help on helping Presentation Manager understand that my second external monitor has a 4:3 ratio while the primary monitor supports 16:9. The second monitor is offered 1680x1050 or 1440x900. The monitor looks best at 1600x1200, which the NVidia supports through the control panel, so I'd like to adjust/edit/hack the Presentation Manager to get it to set that configuration while leaving the primary monitor at 1440x900.