Well, after some tweaking and playing around, I figured out that I could change the aspect of the projector step by step, but not by punching in the desired aspect. By inputting the "Aspect" code - the projector brings up a menu where you can cycle through all of the available modes. This however, is not how I want to do this.

I want to activate a macro when I push the button I have mapped to the DVD control page that switches the mode to Letterbox; and when I push Satellite, I want the C3XE to switch to Anamorphic.

I'm going to keep working on getting it to work - any suggestions or tips would be greatly appreciated. If I get it working, I'll be sure to let you know how I did it.