Feedreader 3

1. Yes, that is partial answer to my question.
The good point is that I can sort the header list by feed with CTRL + 4.
I also assume that by updating this smartfeed, then only my favorite feeds will be updated, and not others, which is what I want.
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However, it does not 100% satisfy my request.
It is as if you suppressed the "View > Hide read feeds" feature and replaced it with a smartfeed for unread feeds only. It does not exactly do the same thing. With a true "Hide non favorite feeds" similar to "Hide read feeds", you keep your feeds in the original folder structure.
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2. This does not work for me as my favorite feeds are scattered across several folders and I do not want to change the folder structure.
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In the end, I still need a "Hide non favorite feeds" feature.
As a "Hide read feed" feature already exists, adding a "Hide non favorite feeds" should be just a small strech to code from the existing function, not too big a deal I guess.
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1. Another trouble with solution 1. is that my favorite feeds could be smartfeeds. For example, some of my smarfeeds are just filtered versions of regular feeds.
So solution1 works only if I can make a smartfeed of smartfeeds. But in a smartfeed, I can only see "Feed name", I cannot see "Smartfeed name" when adding a new condition.

You can make a smartfeed of smartfeeds by combining them. Just to your information.

You are right, I had forgotten about this feature. By combining my favorite smartfeeds (or feeds for that matter)and pressing "Update feed", I can now launch an update of my favorite feeds only.
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My suggestion about "Hide non favorite feeds" still remains for the other reasons stated above.

Please don't see this as a try to belittle your idea but I can't use the hide features like "hide articles/feeds" at all and although I want some improvements as well, I'd rather like to see that program be kept as simple as possible.

What do you mean you can't use the hide features like "hide articles/feeds". Do you mean that you don't want to use them, or that for some reason, these features don't work for you?
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When I have hundreds of feeds, half of them read, I find it very useful to hide read feeds in order to concentrate on feeds with remaining unread articles. For me, the hide feature is really a way to keep the program simple and easy to read. In the same vein, I wish I could hide non-favorite feeds in order to concentrate on what is the most important to me.
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I don't want to use them. I only use 4 smartfeeds to read the articles and all the feeds are organized in folders. I don't have any problems to keep the overview over my 300 feeds. Sometimes I want to click feeds even if they are already read and if I used the hide feature I had to unhide them every time.