While we've described using this process for volunteers who want to return, you may want volunteers that have left under good circumstances to access their "My info" page, or run VSys Live self-reports. You can use the same setup as above to permit that: just don't give them any applications to fill out!
There's only one "inactive but eligible for return" rule - it's not meant to differentiate between who wants to come back and who just wants to see their old data.