Unfortunately, due to the technical limitations of the Referrer Type report in SiteCatalyst, we cannot offer this same report with the Visits metric in ReportBuilder.
While this is a high priority feature for us to add, there is great complexity in delivering and displaying this information via ReportBuilder. As a result, this will be a long time coming, but thanks for the great idea!
While we do not plan to support fully automatic dynamic segment creation in ReportBuilder, we are working to allow simple segment creation from Excel selections that could achieve this purpose.
I apologize for the confusion here. We are working on a way to improve the menu system, but the classification breakdowns should still be available to you in ReportBuilder, but they appear at the very bottom of the list of dimensions under the Custom Conversion menu item.