Currently, only daily uniques are available for eVars in Report Builder. Unique Visitors should be available just like they are in the web interface. Thanks!
Unique Visitors should be available to all v15 report suite eVars under the "Standard - traffic" metrics dropdown menu in Step 2 of 2 of the create request wizard. If it does not show for you, I would recommend opening a support ticket with ClientCare.
Thanks Eric. Yes, UV's are available under the "Traffic" metrics, but it would be great if they were in the "Coversion" metrics so you could build one table with multiple metrics including UV's. Currently, you would have to build two tables using the same dimension to get your events and UV's in a workbook. This is not the case when working within the UI.
Thanks for the clarification. It is a good idea, and we need to add support for it in the Web Services API, too. We are considering this feature for v5.0 of ReportBuilder.