Coracle is adding support for communities soon, see this PR: https://github.com/nostr-protocol/nips/pull/875
The PR re-words NIP 72 so that moderation is optional. Moderation won't exist in the first version in Coracle, and ultimately I think it should be done based on web of trust, or users selecting their own mods, not top-down as is currently done. This doesn't require a whole new spec, just a few clients that do things differently.