Feature request - more detailed reports

Feature request - more detailed reports: I would like to see more options for the report generation. For example, I would like to have an option that only an overview of the customers is created, whose last paid invoice is 4-6 weeks ago - and really only the last invoice should be considered. Or an overview of the customers with the indication how long ago the last paid invoice was. So not just a defined start and end date, but within unspecified time periods. If such a report can be saved as a SQL query, one could create regular reports...