It's been discussed a bit. Most likely, this would end up being a sort of "mini-federation" between magazines / communities with similar purposes, so browsing one of them would pull posts from those internally federated instances too. It would be awesome if someone capable took this on as a project!
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Yeah, it'd be pretty nice for similar communities to opt in to co-federating (I imagine on the backend a submission to one mag would submit to all mags, and the UI just has to be smart enough to dedup)
It'd be awesome to see a multireddit type feature, definitely. I think it has an even larger use case here than on reddit since here individuals could have a way to consolidate communities.
I like how the userscript Kbin Subscriptions Panel groups magazines/communities with identical names. Makes me wish I could press something that opens up all these identically named ones into one "feed".