I truely hope this feature will come in the app. I am still at the beginning of the podcasts and it’s hard to keep track of what I’ve listened to and what not. Especially when I haven’t listened in a while.
Just a simple check box to see if I have played the episode already or not. One The user has to check after listening. You could even include a “favourite” button, where people can have a little star instead of the check box to indicate their favourite episodes.