FirstBoot

http://fedoraproject.org/wiki/FirstBoot

It also has a mode known as reconfig mode to let you reconfigure user settings that were originally set in the installer. This is generally useful to IHVs shipping hardware to an end user so that the end user can do things such as select their language, set their root password and configure their network. To start this mode, touch /etc/reconfigSys on your system.