Let me preface this by saying that I think that r/AskHistorians is already doing an excellent job by providing us with an enormous amount of research material including link to great database and a great booklist. That's said I think that the sub would be even more helpful if it were to suggest stuff like podcast ( other than the great askhistorian podcast) and good documentaries or college lectures freely available online. There is so much content like this online but the quality of historical research can vary a lot so I think that the advice of experts in the field can really be beneficial to avoid misinformation.
There is a Documentary section in the booklist, actually.
To be sure, it is not very up to date, but it also speaks to the underlying issue of this request. The booklist is always an ongoing project and it is entirely dependent on the time and effort of our volunteers in the flair community who can set aside time to work on it, and maintain it. The existing pages are already tough enough to update periodically, unfortunately, without adding new sections to it which would need to be created from scratch. Which is all to say that while adding a Podcast section isn't something any of us would be opposed to, it is also something which we would need to have flaired users step up both to create, and to help maintain. If one sees this, and thinks "Wow, yeah, I'll do that!" we'd be thrilled to see it happen, but we really can't make any promises that something like this could materialize in the near future even if, on its own, it is an appealing idea.