This is brilliant! I assume it's okay for mods to link to?
The only suggestions I have to add:
Post has been used in games I've been in; both in reference to the original journal entry, and also as an alternate term for tag (derived I think from "Post Comment"). A new player we had was thrown by the interchangeability of 'posted' and 'tag,' and also that tag was 'tag-you're-it' as well as the tag feature, which you covered already!
Mandatory Plots might sound a little self evident, but recently I've seen a few games that have this feature where the mods get to choose characters to put in a scene, or have in-game events that all characters have to participate in. It's not godmoding, but it is a situation where players might not have complete control over their characters, so newbies might benefit from knowing the term?
Posting Requirement/Posting Minimum also self evident; they usually vary by game but can refer to how often you need to make a post yourself, how active you need to be when playing, or even word counts.
Thanks for compiling this, it is very very useful!