I am attempting to create a modification that will pull the 5 most recent feeds from a user's Formspring account (as identified by an identity service) and display them in a tab. The first problem I'm facing is that I am unaware of where to start with extending the RSS functionality in XenForo. Would I be looking at XenForo_ControllerAdmin_Feeds? Also, should I use XenForo's caching system to store the feeds in the database and cache the results when called or should I just use a remote call to Formspring's API when the data is requested? TIA for any input.