Currently, Funnel supports the following Doubleclick Campaign Manager report types:
• Path to Conversion
Reach and Cross-Dimension Reach reports are currently not supported by Funnel.
You can include any dimension or metric you want (except reach, ratings and percentage metrics) as long as it's available in a supported report type. Read more about how to create a custom report and make sure it works with Funnel here.
For the metric Paid Search Average Position you will also need the metric Paid Search Impressions included in the report.
See also: Googles help articles on the Report Builder