There are a few things that also use the hostname in Fedora.. Like the default label for your LVM created during the install. Changing your hostname won't affect this name, just make sure to leave it the same in the LVM name, /boot/grub/grub.conf and in your /etc/fstab.
What other things have you noticed the host name being a part of the label on?
(and yes, when you get the hostname changed correctly, it will be taken care of in the prompts, etc... )
Also, when changing the host name, if it is currently localhost.localdomain, then add the new hostname to your /etc/hosts file, but leave the localhost name in there as well. Some applications specifically look for localhost, and you could break things by removing that name for your /etc/hosts file. (make sure to change the entries for IPv4 and IPv6 as well.
(example /etc/hosts file below to show what it would look like for a system with host name tower20.home)
127.0.0.1 tower20 tower20.home localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 tower20 tower20.home localhost localhost.localdomain localhost6 localhost6.localdomain6