Install Advanced User options...

[Kamil Paral]

> Also, wouldn't it be preferable to have "firstboot" (if that is what
> it is called now) skip the user creation dialog if a user was
> created during the install?

Yes, that is the plan, but it's not implemented yet.

Firstboot is dead now, the new tools are called initial-setup and gnome-initial-setup (yes, there are two of them, it's another loads of fun we need to deal with).