Gentoox should have maximum resolutions for Xbox v1.6 because i have 1.6 and gentoox is not viewed properly whatsoever...it works fine but slow all the time..probably the kde or whatever
1. use xfce
2. modify your xf86config file (in etc/x11) to include a virtual desktop that is larger than 640x480. Look in the xf86config.example file to see how to do that.