With the latest release of Adobe Analytics we added a new metrics selector that allows you to search and filter metrics much more easily. Admin can create their own tags (which can be filtered in the selector).
With the latest version of Adobe Analytics you can create a metric like this. Show visits where Segment(Page views > 4) That will give you the number of visits with more than 4 page views.
With the latest release of Adobe Analytics you can now apply segments to calculated metrics which allows you to be able filter down to certain audiences (e.g. evar1=cars).