It isn't that new -- Emacs has had it for a few decades now.

Do any PDF viewers for Windows reload files automatically when they are updated, like Skim does on Mac?

I use Omea Pro currently and would be perfect except for a few annoyances:

I want decent keyboard shortcuts. It is better if they are configurable.
This is compounded by the fact, that periodically Omea decides for some
reason to switch to showing "All" items in the newspaper view instead of
"Unread" >:( So I have to use the mouse. I'd also prefer to see only feeds
with unread items in the feed pane, and Omea does allow this. Except when
new items are downloaded or the current ones read, the feed pane doesn't
change, which makes the feature kinda useless >:(

This is why I tried to look for another feed reader. The ones which I have
most often seen praised are Feeddemon, RSS Bandit, and Greatnews.

First, RSS Bandit. I import my OPML file and see that folders
and feeds are interspersed in the feed list. Great. Ok, this can be dealt with.
I will just create a new folder for all feeds at the top level. Right? Right click on
the feed list. No way to create a folder. Well, there is a "New" button on the toolbar...
No, it is useless, too. Ctrl-Shift-N? No. Well, let's look in the Keyboard Shortcuts
section in Help. It says that F4 creates new subscriptions and Shift-F4 creates new categories.
Neither of these work, so I uninstall it.

Greatnews: I used it for a short time before. That's where I discovered
newspaper view. Then I discovered that Omea Reader had it as well, except
newspaper didn't constantly lose focus and I didn't need to use mouse
to get to any particular item in the newspaper. After checking I see it didn't
change that much, so away it goes too.

Feeddemon: Again, I tried it for a short time before, when it was version 2.0.
Wasn't at all impressed with it then, and didn't buy it. Now, however, it's great.
It doesn't seem to have any of Omea's problems listed above. While I wish it
showed the total number of unread posts I can certainly leave without this.
It is also noticeably slower than Omea.

Are there any other readers I should check out before buying Feeddemon? The
requirements are simple: stability, ability to handle a lot of feeds (over a thousand),
newspaper/river of news view, good keyboard shortcut support.