Two #Mastodon features I'd love to see:
1) Hashtag mute for short durations, maybe 1 to 24 hours (this would be useful for following a hashtag on the main timeline without being flooded by posts at certain times)
2) Add hashtag to a list (so I can remove it from my main timeline but still follow)
There's some overlap between these two so maybe just #2 would suffice. I think they'd both be useful.