I was having a look at the way the project -> Configuration -> Metrics graph time-spans work and I guess that the behavior is unexpected. When I select a week, month, quarter, year etc I would have expected the scale on the x axis to change to the value selected on the drop down option list. When there isn't enough data to fill that, I would expect that part of the graph to be blank. So if I select Month [?Calendar vs Last 31 days] I would expect the scale to show 1 - 31 days along the bottom.
This is one of the big features I would like my customers to have access to, so they can see the progress of code changes. I know they will be watching these extensively and is part of the "agile service pitch" our business will use.