"Notify me when available" as a persistent setting?

[AnthonyL]

Is it possible to tag someone with "Notify me when available" permanently so that I get a notification every time their presence changes to available? Currently, if the contact goes Available and then Away again, I wouldn't be notified the next time they came back. It would be useful for those moments when I miss that window to grab them, especially for people that spend a lot of time away from their desks!