In Ad Hoc Analytics it's possible to use participation metrics.This is
something that we often use.In workspace this metric doesn't exist.Its
possible to get the same results by creating a segment but having the
metric would be easier.
Currently it's not possible to make the following breakdown in
ReportBuilder: Mobile devices with the breakdown browsers (metric
visits).It is available in SiteCatalyst en Ad hoc analysis. According to
ClientCare this isn't a bug.