During the process of configuring a modern graphical desktop any number of tools are required to configure its operation and aesthetics to suit the tastes of the user. The Gnome desktop is no different. The Gnome developers, having built an excellent desktop, have produced a number of tools that support the configuration of the Gnome desktop. Four of them are shown below.
My recommendation for future versions of Gnome is to combine three of them (Screensaver Preferences, Screen Resolution Preferences, and Screen and Graphics Preferences) into the forth, Appearance Preferences. One of the tools, Screen and Graphics Preferences, also needs to be configured so that it doesn't require root permissions to operate (after all why should it?).
The idea is to bring all the tools that allow for desktop configuration into one convenient location.