It would be useful to be able to compute editor retention metrics by scheduling a report in advance. For example, say I have an edit-a-thon on 9/21/2014. While running metrics to see what happened during the event, it would nifty to be able to schedule reports for 12/21/2014 and then 3/21/2015. Reports could be emailed once they are ready. A pleasant surprise for your inbox!