I wish that Fedora would fix the gdm-setup package to work. But until that time, I found you can disable the long login name list with the following:
GCONF_CONFIG_SOURCE=`gconftool-2 --get-default-source` gconftool-2 --direct --config-source=$GCONF_CONFIG_SOURCE --set /apps/gdm/simple-greeter/disable_user_list --type bool TRUE
I had a number of issues getting Dansguardian working, even after a clean install of the package. You need to do the following to get it up and running.
cd /etc/dansguardian ln -s /usr/share/dansguardian/lists