I can edit the names of all my bookmarks EXCEPT those associated with RSS Feeds. I'm not talking URLs, of course, just the aliases. Some of them are longer than I prefer and I'd like to shorten them, but clicking to edit the Bookmark name doesn't work. Any suggestions?
Are you attempting to edit the RSS bookmark name via the feed found in the "All RSS Feeds" collection? If so, that won't work.
Rather, you ought to be editing the actual RSS bookmark found in either the Bookmarks Bar or Bookmarks Menu collections. Single clicking on the name ought to open the editor. Those collections are found in your Bookmark Manager (command/option/B keys).