Your problem has nothing to do with RSS. I have it, too, reading HN in the "normal" manner. My solution is, when I go to a story, to open two tabs: one with the story and one with the HN comments. Then I can switch between them.
Still, I would welcome a more automatic solution, but I don't know what it would look like. (The comment by bmelton on the Digg bar is quite correct.)
Your problem has nothing to do with RSS. I have it, too, reading HN in the "normal" manner. My solution is, when I go to a story, to open two tabs: one with the story and one with the HN comments. Then I can switch between them.
Still, I would welcome a more automatic solution, but I don't know what it would look like. (The comment by bmelton on the Digg bar is quite correct.)