"Guard-rails" for categories which should have only scheduled posts?

Use case:

an “Announcements” category which people should not post in accidentally
a “Draft Announcements” category which anyone signed in can post to
some set of people who can choose to schedule those posts[1]

I assume that in order to schedule publishing to a category, one must have permis…

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  1. see related feature request, but could just be mods/tl4 ↩︎