The double paneled view would be useful when curating posts. However simply being able to view more posts on the page would be beneficial as well. There is a lot of scrolling required currently, and anyone who curates knows how much time the process takes. Anything that could improve the rate upon which posts could be viewed would be a useful addition. So I am in favor of both or either of your suggestions.

As for filtering, at the barest minimum we should have the ability to concurrently view a subset of tags at the same time. Curating multiple tags is a chore, especially considering the overlap of content. Being able to bring them all together at once would save a lot of time as well.