auto closing/suspending stale communities stale could be defined as unanswered mod reports, no mod activity (no post, comment, login in x time period), no posts

No. I’ve seen several times people ask the admins if they could take over a community. And it happened. Thus reviving dead communities.

staggered new account permissions: wait 24h before commenting, wait 7 days before posting.

Why?

allow community users to flag posts or comments as NSFW.

This one I like.

Voting changes from up, down to up, down or NSFW.

That’s not how it should be done though. The same menu that you pull out that lets you report things to a mod, instead of reporting to mod, it should let you report as NSFW. If a mod approves the request, it then becomes labeled as NSFW.