Yep this. Call in sick, quit, max out your credit, go halfway around the world, do literally whatever is needed to be done to see a total eclipse if you haven't been able to experience it yet. It's unreal.
For now you can tap the "X" in the top right. Tap to dismiss anywhere is possible in the future, would probably be best to make a Github issue to track.
Yeah this is something I want to add. Should not be too bad. Can you give some specific examples? I assume you want to block specific (and entire) domains.
60 days notice is standard on Mastodon, it would be nice to see instances commit to that.