Install and open TweakUI.
Click on the Templates option in the left hand side of the window.
If you wish to remove any options available through the new section, you can highlight the icon you wish to remove and click the Delete button.
If you wish to add new templates, click the Create button and locate a file of your choice to add. If a template has not been created for the file you are attempting to add, you will receive an error. I think!