The biggest thing I’d love to see in Ghost, even though it’s a big ask: support for the Mastodon API. Doing this would probably require implementing all of Mastodon’s other standard microblogging features first.
The benefit would be that I could use my Ghost account as my primary Fediverse identity, though. I would love that!
If you have a fediverse account, you can quote this note from your own instance. Search https://deadsuperhero.com/.ghost/activitypub/note/9588b4b0-2608-46b6-8b9f-7c82d693f75f on your instance and quote it. (Note that quoting is not supported in Mastodon.)