I know this is an old post but I wanted to offer a +1 for this feature. It looks like the current “week” time period is literally the current calendar week, and it would be better in my opinion if it were the PAST 7 DAYS. Same think with the today period… perhaps it could be the last 24 hours on a rolling basis rather than the current date (or offer both “today” and “24 hours” as options).
Most of the data in the widgets needs a little bit of data to be very useful, so currently, the first few hours of the day are not very useful for reports while the visits are filling in.
You also might want to offer an almost real-time period of perhaps the last 3 hours so that the widgets on the dashboard are giving you a much better feel for what is currently hot on your site, along with trends that may be emerging while you still have time to help fuel them.