I talked to Talidan last night on IRC. So far we tried one way, he sent me a .SET file with a 16:10 resolution. That didn't work. He checked the source code and said he might know of another way but he had to go so we'll see how it goes tonight.
I can see the resolutions in MTA ( 1920*1080 , 1280*720 , 1024*768 , 800*600 , 640*480). I can only see these in GTA (1024*768 , 800*600 , 640*480)
My GPU is an ATI Mobility Radeon 4650 (The 1GB version)
CPU is a C2D 2.53Ghz - P8700
4GB of Ram
1920*1080 Default Screen Resolution.
Using Vista 64bit.