YA-NewsWatcher question (and other Classic Mac OS compatible newsreaders)

So, I'm using YA-NewsWatcher, and I quite like it, but there's two
things that bug the hell out of me that I can't figure out how to fix
in its preferences.

First, I'd like to keep read posts; at the moment, when I load a group
and read posts, when I close and save, the read posts are not visible
the next time I visit. In more modern newsreaders, there's been the
choice to keep or discard read posts, but I can't find such a setting
in YA-NW. Is there one?

Secondly, threading; posts are gathered into threads, but the threads
aren;t properly threaded, all follow-ups are nested beneath the
original post, which makes it awkward to easily navigate the thread and
follow the conversation. Again, other newsreaders I've used on OSX
provide proper threading. Can I make YA-NW act like this?

What other OS9-compatible newsreaders are there that I can configure
like above? I've used Thoth recently but it was pretty buggy and prone
to crashing (although that might be more the fault of the OS9 install I
had then, which was an absolute mess). I used MT-NewsWatcher some years
ago but can't remember if it behaved differently on these aspects than
YA-NW does.

Would appreciate any reccomendations for a better Usenet experience. :)