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Yes, that's precisely what it would be; an ATOM feed for private galleries that you can push extensions to. I think only MyGet supports it now, so we will look to them for how they handle pushing, so it can be consistent.
Most of our enterprise customers wanted to create a workflow like they do with NuGet.org, with only certan public packages in the feed, etc. THat is, they didn't have custom extensions, they only wanted to restrict or cache public extensions for their developers.