thanks for your wonderful plugin!
With bp-multi-network the digest function of Buddypress Group Email Subscription plugin by Boone sends wrong mails if a group of the one Buddypress network has an equal activity id as a group with same group id on the other network.
Maybe you want to add this to bp-multi-network.php ?
// Group Email Subscription 'ass_digest_items' => false, 'ass_replies_to_my_topic' => false, 'ass_replies_after_me_topic' => false, 'ass_self_post_notification' => false
I also started a request at Boone's plugin support page for compatibility: http://wordpress.org/support/topic/plugin-buddypress-group-email-subscription-request-for-multinetwork-compatibility?replies=1#post-3078508