🚀 go-pugleaf

I've been using GNUS for several weeks now, just to compare it with
Gnews.  It is nice and efficient and does most of what I want, but
there are a few things that I haven't discovered how to do.  I'd
appreciate it if someone could answer the following questions:

1. When entering a group, there seem to be two options: read the new
articles, or read all of the articles.  While reading the new
articles, I haven't figured out how to go back to an article that was
read in a previous session.  After reading all of the new articles,
re-entering the group retrieves the headers of all previous articles,
which may take a long time in a group with hundreds of messages.  Is
there any way to select only some of the previously-read articles?

2. When typing "n" or <space> at the last message in a group, it asks
for the command to be repeated in order to go on to the next group.
This is very annoying -- is there any way to make it just go to the
next group and select the first article?

3. An article is marked as read as soon as it is selected.  Can this
be changed so that it is marked as read only after reaching the end of
the message (or junking the message)?

4. Why is C-h m (describe-mode) so slow?

5. How does one insert the article being replied to in a reply or
followup message?  (Other than manually copying it from the *Article*
buffer.)

6. When a cross-posted message is read, it is marked in all the groups
to which it was posted -- even those that I don't subscribe to.  This
adds considerable junk to my .newsrc file.  Is there a way to make it
mark the article only in groups that are subscribed to?