* "Block replies to this post from these servers."
* "Only show on the public timelines posts from servers that are manually approved or are interacted with by a local user, otherwise do not display them by default"
etc.
We can get _much_ more finely grained than the coarse block/silence/do not block levels we have today.
Several people have also talked about adding _relational mechanics_:
"Only allow unapproved follow requests from people followed by people I know on this server."
etc.