The change regarding Web Channel country & scheduling is now live.
New web channel policy: The country property indicates in which country the channel operates. It should only be set for Web Channels that are available exclusively in a single country, such as CBS All Access or BBC iPlayer. If it's possible to access the Web Channel from more than one country, for example Netflix or Youtube, the country property must be left empty.
New episode policy: Episodes that premiere on a Web Channel can have their airtime set when the Web Channel only operates in a single country. For Web Channels that operate in multiple countries (such as Netflix), the airtime cannot be stored.
Added to the episode policy: It's not allowed for two seasons to run simultaneously. For example, there cannot be an episode in season 2 with an airdate that's before the last aired episode in season 1. If a source provides season numbering like this, it should be discarded and you should look at the next best source instead. If none of them offer a valid season numbering, fall back to year-based numbering.
A pretty big change in the policy for straight-to-DVD shows: https://www.tvmaze.com/faq/13/shows. They can now be added to TVmaze, provided they meet the same requirements that we have for non-curated web channels. For these shows, the new property "Dvd Country" should be used to indicate in which country the DVD was initially released.