Re: Additional buttons in messages
I’ve just proposed the adding of a new action hook that would make it easy to develop a plugin for this. The action hook is suggested for another purpose, but would work for this purpose as well.
See https://buddypress.org/forums/topic/new-plugin-buddypress-rate-forum-posts/page/2#post-39751 – the proposed action is bp_single_forum_topic_links
If that hook gets incorporated, then writing a plugin to do what you want would be very easy.
Alternatively, you could also just modify your theme directly, to add it. See the theme file groups/single/forum/topic.php</b> , in the loop:
while ( bp_forum_topic_posts() ) : bp_the_forum_topic_post();