There aren’t any system to prevent users to hotlink images. I’ve managed a forum with more than 50 thousands unique visitors per day and in that situations is absolutely imposible. The only way is to have a lot of moderators
The only way to avoid that is to prevent hotlinking, a bad practice in forums, blogs, etc. Notice your readers not to hotlink images from other sites, I think is the best thing to do.
That RSS you demand is integrated in bbPress. In your browser navigation bar, if you click to the RSS icon it shows you the list with the two RSS feeds availables. One is for latest topics and other one is for latest messages in all topics. If you see my forum ( http://forowordpress.es/ ) I’ve added two links to both in the sidebar (redirected to feedburner as you can see). 
You’re wellcome ericharison
I’ve downloaded it and installed, and the version remains the same (alpha 5) 😮
I’m finishing my new forum (latest was made with SMF). I’m using bbPress 1.0 alpha 4 with the default theme (in blue and customized) and several plugins (a lot):
– Akismet
– Attachments
– Favourites notification
– Registration notification
– Temporal Ban
– bbcode buttons
– smileys buttons
– Related topics
– Signatures
– bbcode lite
– bbvideo
– post count plus
– support forum
– mass edit
– hidden forums
– active users
– bbpress karma
– terms of service
– human test
– report post
I’ve made the translation of bbPress 1.0 to spanish ( http://ayudawordpress.com/bbpress-espanol-alpha-104/ ) and the forum URL is …
htp://foro.ayudawordpress.com
Buenas 
Acabo de traducir bbPress 1.0.4 Alpha al Español. Si queréis descargar tanto el .MO como el .PO los tenéis en mi blog.
¡Feliz Navidad!
I’ve solved it. The guilty was the plugin Forum Restriction: https://bbpress.org/forums/topic/plugin-forum-restriction
Same problem. I see the markups but doesn’t work 
