Sorry for late response. Let me understand your needs correctly. Do you know which users you want to observe? If so you should use some kind of news aggregator like Digg Reader or Feedly (these are cloud services) or TinyRSS (you can host it yourself) or Thunderbird (and I belive that, there are tons of extensions for Firefox and Chrome that might be usefull for you as well). You will get single list of news from bitcointalk.org and you will be able to share it with other users.
My issue is that I already have an RSS reader (The Old Reader), and I have lots of other RSS feeds in it. So my "view all feeds" feed contains both bitcointalk posts and lots of other stuff that I may not be in the mood for. What I'd like to do is have the bitcoin talk feeds appear in one "feed"/stream, so that I can just click that feed and see what's new on bitcointalk today. But currently I have to read the individual feed for each user.
Are you saying that other RSS readers allow you to create custom feeds composed of multiple 'base' feeds?