As an example, your summary page assumes you want to look at all open items. I happened to be interested in all items that were closed, grouped by category and not milestone. I also wanted all open items grouped by category then by type (bug vs. feature) and again not grouped by milestone. (I.e. just all open items.) Maybe this could be done by querying and then indicating how you want the data grouped?
My objective was to extract information for a presentation. I extracted counts and put the data in excel and then greated some simple pie charts and bar graphs to show where the percentage of problems were occurring. Ok, that is another feature request.

Thanks.