1) The application controller is separated from the other controllers in the Rails view of the project structure. Unlike other controllers, subfolders and partials within the corresponding view directory aren't displayed there (for example: /app/views/application/subdirectory/_partial.html.haml), which is inconsistent in my opinion.
3) For others this might not be the case of course. Wouldn't it be nice to add another kind of view with a customizeable hierarchy of items? I guess, I'm not the first one who puts this on the wishlist!?