I just installed the same drivers on my system. Mine are also frozen at 1024x768 @ 75, which was the default in the normal FC5 installation.
I also noticed that there is a new GUI setting for the NVIDIA drivers, called
nvidia-settings. If you run the command as root user, it gives some basic settings, but not what we are looking for.
Did you see
this article on the subject? Again, it does not mention what we are looking for, but has useful information otherwise.