"Unless things have changed since the last time I installed Fedora,
firstboot is set to run the first time you boot after the installation,
and that's where you're prompted to create your first non-root user"
I don't know when the last time you checked but firstboot is not used in Fedora anymore.
Tom Horsley wrote:
Um... Unless you want to be able to login after the install :-).
You can login just fine without having a local user on the system. c.f "Enterprise Login" support in GNOME.