Well I have some work still to do on it, but my BuddyPressActivity plugin, uploaded yesterday, will successfully insert an activity to buddypress when new forum posts and comments happen in Vanilla. Currently it just posts without attributing the user, discussion title or category name, but a generic message that says 'Someone posted a new discussion in the forum', with a link to the latest discussion, is better than no activity at all. And those other things can be added later...
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Not much happening here, yet.