BuddyPress.org

Found this snippet but I would still like to know how to turn off activity replies to comments all together. This snippet limits activity comments to 2 comments. It is placed in the functions.php of your theme:

//begin comment limit snippet
function test_comment_depth_limit( $can_comment, $comment ) {
if ( $comment->mptt_left > 2 )
$can_comment = false;

return $can_comment;
}
add_filter( 'bp_activity_can_comment_reply', 'test_comment_depth_limit', 10, 2 );
//End comment limit snippet