I took my issues with NewsFox to the developer in the form of having it open in a new tab and clarification as to what I would like to see in categorization.
Given the overall lack of enthusiasm by the developer (in the first link I asked if said dev was being deliberately obtuse, and in the second I said “you win, I give up. I’ll try a different reader), I’d like to tell you that I’m currently testing the Wizz RSS reader. At first glance it seems to have everything that I was looking for in NewsFox – it opens in a sidebar, and now the feed organization seems to be the way I want it.
Have no fear, further updates will be coming.
Update to the update: Google Reader, I love you.