nvidia-config-display misbehavior

Since nvidia driver is currently not working well with my system, I wanted to give nouveau another try. I edited xorg.conf, changing from nvidia to nouveau, then did nvidia-config-display disable. Then telinit 3, telinit 5. Surprise! No X. After investigating, I found that every time I run telinit, nvidia script will _rewrite xorg.conf_! Imagine my surprise. nvidia-config-display disable doesn't actually disable nvidia. The only reliable way to disable (temporarily) is rename the kernel module. (I don't want to yum remove nvidia stuff, last thing I need to is have to have a working network connection to restore it) Why would anyone want to type 'nvidia-config-display disable', only to have it magically re-enable itself?