[@r-a-y Keymaster 15 years, 5 months ago]

This issue has been brought up in the past.

You can disable the ability to use the activity stream to reply to forum posts by doing the following:

– Login to your WordPress install.
– Navigate to “BuddyPress > General Settings”.
– Under “Disable activity stream commenting on blog and forum posts?”, select “Yes” and save.

There is currently no other solution to sync activity replies to forum topics yet.