Subscriber options: daily and weekly digests

I'm filing this under BuddyPress even though it's not strictly a BP issue, but whatever solution I use would have to work with BP.

I'm using
WP 3.2.1
BP 1.5.1
Theme: Edu Clean

How do I make it so that subscribers can edit their subscription options such that they receive emails for posts as they're published, daily digest, weekly digest, monthly digest, etc?

There's this plugin but it includes a separate registration form for "public subscribers" as opposed to people who have registered with my site. Is that too many registration forms? I think so.

To me, a subscriber is a subscriber. And, if they're a subscriber, it would be wonderful if they could opt to see my latest posts in a digest format.

Any ideas?

Thanks!