Great suggestion. This is something I've been interested for quite awhile. Right now it requires you entering in the primary keys or IDs that are captured in the variable. I don't recall how or if this works with the different containers (Page Views, Visitors, Visits) though, but it should where applicable.
Lost track of how long have been asking, prodding, pleading, demonstrating the need for this. It's the path to truly unlocking business insights by applying knowledge we have in the business to the click stream that can never be collected at click time - HUGE need...