Do not know if you are like a small set, often in order to change a setting frequently in and out of the "system Preferences"? But using it only to bring up the display, sound and Exposé and spaces settings, what about the other settings? Find and enter the/system/library/preferencepanes/directory, and you will find that all of the System Preferences panel items are included in the directory. If you are constantly sharing system settings, drag Sharing.prefpane to the right of the Dock bar, and you can access the shared (sharing) Setup Panel later. PS: If you want to drag it to other places, such as the desktop, you need to drag the same time you press the CMD + Option key to generate a shortcut.
Of course, if you want, you can also put all the Setup Panel items in the system Dock for easy access:
Create a new folder and name it, such as system Preferences
Select all files in the/system/library/preferencepanes/directory
Hold down CMD + Option during drag and drop to drag all files to the System Preferences folder to create a shortcut
Drag and drop the System Preferences folder in the System Dock bar to