@lain I don't know if you saw my posts the other day about a delayed/private outbox type thing to allow for deletes/edits before federation (maybe 60 seconds or so, but the un-federated post is included in your timelines so it looks to be officially posted locally; accidental favs/boosts can be undone without anything needing to federate, etc) but that would be a nice type of addition too and may be tangentially related

Lots of ideas, just need time to experiment