Thanks for your response, however the Registry Key option is not quite what we are after.
We're looking for the "Overall" page to have the same time period views as the individual resource tabs (i.e. Past hour, Past day, Past week, Past month, Past year). Whilst the Reg Key option is good, it doesn't solve this problem.
One of the reasons for wanting the Overall tab to have more flexibility is so that it mimics the look and feel of the individual tabs and can be used to view the Overall status of servers to see how performance may have been affected over a specific time period.
BTW, when is Version 4.0 due out.