Problem you may be having, or feature you want:
If I add a podcast with a long history, It would be nice to listen all old episodes.
I do not wis to push all into the Que because it would overflow all other podcast and a huge effort for sorting is needed.
Suggested solution:
Add a tick into the Podcast setting add old and not listened episodes all XX days and add an edit button where I could setup a repeating time frame. e.g. 3 day
So all three day the next oldest Episode get pushed to my que
Personally when wanting to listen to episodes from the backlog of one or more of my subscribed podcasts I just go to that podcast’s episode list in the Subscriptions tab and manually add to the Queue any I want to listen to in my upcoming listening session. It would be tricky to automate this as my selection(s) depend on on what I feel like listening to at that time and how much listening time I expect to have.
At moment I have three such Podcasts with Backlog. I for my self like it to get supprised by what is currently in my que and may reorder them. But I do not like It to choose what next. Becasue I like most of the Episodes and if not I have to listen to say so.