A few questions regarding podcast/audio-only submissions

I've recently added an audio-only podcast on IMDb for the first time and as a result I have several questions on how the whole thing works: -Should serialized podcasts have "audio-only" and "category-podcast" keyword added to each and single episode or it is fine to have them on the series level only (as is the normal way for web-series)? -I assume that radio shows are still ineligible, however radio broadcasts which are also specifically podcasts should be, right? In the case of "The Ian Dempsey Breakfast Show" (2013) 2-hour radio episodes are re-released as much shorter podcast episodes, often containing one segment per episode. -Should radio plays later re-released as podcasts be added? For example, would a radio play directed by Andrei Tarkovsky and released in 1965 suffice as an eligible title, considering that recording was re-released in an audio format not unlike podcasts or audio plays already eligible and featured on the database? -Should in that case original radio broadcast date be added as a year of release, or first eligible format release date (I would assume that would be 2000 in case of this particular play)?