Ok awesome! Something like this, or even the ability to create your own 'multireddit' would be great. So say if I specifically wanted to look up about a specific topic, I could have a multicommunity just for that, but still be subscribed to more communities overall
The "multireddit" feature has been on the request list on github for quite a while, but yeah the "browse as local" feature is live and mostly working on the internal test release. Some small things are being ironed out and then it should be released to the public soon, I'd say it's 99% there.