To take advantage of the extra features, you need to open the editor's tools file and add them there. See the following page from the editor documentation - http://www.telerik.com/help/aspnet/editor/?UsintTheToolsFile.html
The tools file you need to edit for the Wikis is located at \Program Files\Common Files\Microsoft Shared\web server extensions\wpresources\RadEditorSharePoint\22.214.171.124__1f131a624888eeed\RadControls\Editor\ListToolsFile.xml
The only thing you need to be careful about is to keep the names of the first two toolbars - EnhancedToolbar
. If you remove/change those names, the editor might cause an exception.
the Telerik team