i didnt manage to put full screen mode on my brother's wide screen.
i dont think its possible ko is too old for that.
however u might try installing updated graphic drivers.. maybe it will open new res. options.
mine GC support only 2- 1280x1024, and 1024x768 for Full and window mode. Radeon support 1600x1200, and also 800x600 (an old card that i have).
so... try it out :X