While I was working on a demo VM, and similar to the Playbook tool (Microsoft Project Server 2010 Server Settings Backup/Restore Tool) I wrote this tool to easily export all the business drivers and impact statements from one PWA instance into a XML file and let you import them all (drivers & impact statements) into another PWA instance (few screenshots below). I have provided the source code so you can modify at will! You could also use this to backup a snapshot of drivers and impact statements at regular interval. I did not include prioritization but you could easily extend it yourself using the documented API in the SDK. This tool further illustrates how extensible the Project Server 2010 platform is.
As usual please test this out on a test environment before using it production.