What about if !politics is used for government-related posts.
Teachers negotiating with government, policy changes for surgeons out of the control of the surgeons themselves, ETS, parliament protest, RNZ tankie issue (not related to our government but fully political in it's own right), these would go in !politics.
All Whites abuse, teacher being a dick, migrant workers being exploited, Mongrel Mob charges - these would go in !newzealand as their relationship to the government is not central to the article.
I also hear concern about the lock-and-crosspost idea. Perhaps when it's not black and white, this is an encouraged split rather than an enforced one?