Time sheet Approval module

It would be great to have a timesheet section which shows all submitted time sheets with a billing status that is separate to the request status. The request is closed from a technical stand point but not from a accounting perspective.

The idea is that the management/accounts team will have a list of all entered time sheets for a period and have a simple approve/deny button that will approve the time sheet. They should have the option to edit the entered time sheet, weather it be the wording etc. The approved time sheets will then be visible in a report which can be exported to a CSV and imported to the financial package.

The pane will only be visible the privileged users.

At the moment we have implemented a similar process using request filter, additional fields in the request screen and various reports but it's taking up a lot of time.