Pivot Table - pivot table open "upwards"

Pivot tables open "downwards" - for example:

Level 1

  Level 2

    Level 3

        Detail

        Detail

This requirement is to be able to reverse that order:

          Detail

          Detail

       Level 3

    Level 2

Level 1

There are use cases where this reverse-expansion direction would come in very handy as per my great discussion with Piers.

 (tied to support ticket 9344)