Time units in Calculated Metrics

I agree. A calculated metric for [selected number of days] dynamically populated with the number of days in the date range of a report or dashboard reportlet. I would like to have two dashboard reportlets containing calcuated metrics for "Average Daily Revenue", "Average Daily Orders", "Average Daily Visits", etc. One for the current timeframe (e.g. this week, this month), and one with my reference timeframe (e.g. last week, last month, this year)

This was also requested in these posts:

https://forums.adobe.com/ideas/8119

http://ideas.omniture.com/t5/Adobe-Idea-Exchange-for-Omniture/Adding-Number-of-Days-Variab le-to-Custom-Calculated-Metrics/idi-p/1828

http://ideas.omniture.com/t5/Adobe-Idea-Exchange-for-Omniture/Aggregator-functions-for-Dat e-Range-s/idi-p/456

In addition, if we could use a calculated metric based on date ranges to achieve a % change metric, then we could determine the fastest rising and fastest declining products (ie Number of orders yesterday compared to last month), which would be very helpful.