This is not something that we could easily (officially) support, as the use case here would be quite limited. However, as a self-respecting SysOp of a multi-line 80's BBS - I can't help but be intrigued here.
Believe it or not, we get some support emails from people still using PINE. Heck, I used it as recently as a few years ago. I don't believe there's ...
type "S" to enter (S)etup.
type "C" to enter (C)onfig.
arrow down to "NNTP Server (for news)", hit enter, type "news.gwene.org" or "news.gmane.org" and hit enter.
Hit "E" to (E)xit setup.
Hit "y" to save.
Press "L" for Folder List.
Arrow down to News and hit enter.
Press "A" to add a newsgroup.
Enter "gwene.mathoverflow.recent" or press ...
Since feeds might be new to many users around here, I have created a separate chatroom for people who want to experiment with them a bit. (And maybe later decide whether they want to start using some software or browser extension for this - if they see that it is useful.)
Unless you are a moderator, you need to be a room owner if you want to edit the feeds ...