Re: RSS for all latest posts
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). 
