Ability to Select Date Granularity When Selecting to "Trend" a Report

Currently, any time a user changes a report from "Ranked" to "Trended", the entire report is refreshed to trend by "Day".  I rarely want the data trended by Day, and would like to see the option to select the granularity at the same time I select "Trend", so the data only has to refresh one time.  My idea would be to embed a drop down menu on the "Trended" link, with values of Day, Week, Month, Quater, Year, and force the user to select the granularity they want to view.