It would be nice if the layout was in a tabbed format or gave the option for different views. If it was in a tabbed format, you could see all of the widgets available and still add them to the appropriate widget section. Once added, they can switch tabs in order to configure the widget. An addition section could also be created in order to create the new custom widget areas. This would provide for a much cleaner look, make it easier to use and allow for addition options for the future.