Done. Let me know what you think. BTW, it's also possible to add feeds or stop them or etc, on your own by sending messages to the bot, as long as you're a moderator for the community where they're getting sent to:
https://ponder.cat/post/248105
I’m especially interested in getting the abstract into the post.
This is a little more complex, since it's not completely trivial. The HTML that comes in via RSS has to get converted into Markdown for example. But I can take a look at it, there's probably a way to do it and it's probably a good improvement.