You see the More System Tools submenu whenever you open the System Tools menu. Several administrative tools listed are in this location, as described in this list:
Desktop Switcher: Red Hat includes the popular GNOME and KDE desktop environments in their distributions.
Kernel Tuning: Your Linux kernel comes preconfigured to work in a wide variety of situations. The default configuration works well for both workstations and general-purpose servers. However, you can use this utility to modify the kernel parameters if the default doesn’t fit your needs.
Mail Transport Agent Switcher: Red Hat Linux installs the ubiquitous sendmail mail transport agent (MTA). You can install the newer alternative, Postfix MTA, and use this utility to switch between them.