Suppose I'm reading an article some way down a thread. Then there will be a list of reference numbers that Usenapp adds at the top of the article window/pane which I can click on to see a previous article in the thread.
But if the article whose reference I click on is one which I previously didn't see because it was filtered out by the Rules, then I can't see it when clicking on its reference.
I'd like to suggest that, if I explicitly ask to see a particular article, then it should be shown even if previously I didn't see it due to its being filtered. That is, making such an explicit request should override the filters just for that request.