When doing a comparision dates analysis (like as before and after a new layout, for instance), the feature "compare dates" do not help a lot - and you need to use only one period for analysing some kind of data, like Next page flows report. If you are comparing today and yesterday, that are no problem, but when you compare, let´s say, two World Cups (2010 vs. 2006) or Winter vs. Summer, or any period that starts in the middle of a month and finish in the middle of other month, you have a hard time on changing every time the selected date.
So a feature that allow users to creat their own preset dates would improve the usage of the tool in this kind of analysis.
