I would like at the subscription level to be able to enqueue the most recent episode automatically download and queue and remove prior episodes that are currently in queue
The most-recent-only setting would be perfect for keeping on top of a frequently updated news podcast.
For the download part you can activate auto download in settings then set your subscriptions to auto download or not.
But I don’t think you can control how many episodes per subscription with option to remove old one.
You can only set global number of downloaded episodes available. And auto remove episodes no longer in queue or already listened.