FEATURE REQUEST: group-specific notifications

I've been wrestling for a little while now with the lack of granularity in the existing notifications system.  For those of us who run businesses online, it would be nice to set weekly digests for general forum-related matters, but be able to have instant notifications for groups of, say, paying clients or students who have questions and issues they post in private forums which need to be addressed sooner (or right away) rather than later.

E.g., it would be nice to set weekly digests for everyone but instant notifications for new content from member group X.

I understand this could get unwieldy if one tries to create new notification schemes for every group, but hopefully I'm getting the point across, e.g. that some of us have priority groups who have paid to have a more direct line to my/our services. 😁