My laptop uses an ATI Radeon X1200, and here's how I got mine to display more than 1440x900:
I went into my ATI Catalyst Control Center, went to Display Options, and under Display Management Options I selected "List all possible modes (including panning modes)." Then whenever I want to play Aurora I go to Display Properties -> Settings and set my screen resolution to 1600x1200. Afterwards I reset to 1440x900