If you are using Word 2007, here's what you can do to customize the settings for just one document or for all documents as the default.
Click the Office icon in the upper left corner of the Word screen,
Click the Word Options link at the bottom of the pop up window.
Click on the Customize link in the left hand column.
In the left column, select "Commands Not in Ribbon"
Scroll down to where it says "End of Document" and select it
In the right column, select what you want to customize, just one document or all documents (default).
Click the Add Button in between the two columns
You will now find a new End of Document icon in the Quick Access Toolbar located above the Home Tab.