OG Integration - token to email all og admins

Can we have a token containing the email addresses of all group admins?

Use cases for this are:

- comment on content in a group, email the comment to all the group admins for passive moderation
- new content in a group, email the group admins a copy of the content
- new members of a group, email an alert to the group admins

and so on.

If it can't go in 5.x and is not already in 6.x please assign to the 6.x issue queue.

Thanks, Stephen