Is there an RSS feed (or feeds per section) for the forums? I'd love to be able to keep up with the posts via a news reader such as Feedly.

Nope, there is no RSS feed (didn't know people still used those )

RSS may be old but it is still very good ... just like ... Live For Speed

Thanks for the reply (and for keeping LFS going!)

There once was "lfsdev-rss" hosted on https://www.liveforspeed.se, but it no longer loads. It was very useful, as it harvested only Devs posts.
My Firefox extension's last feed is dated 23rd May 2021.