Hello,
We talked about this at the Developer's Summit, and it sounded like this was a possibility, but I wanted to post it here so it didn't get lost.
We've have a great need to be able to edit (data/geometry/etc.) a non-sync enabled mobile map package. These updates would never get returned to Pro, or Desktop - they are just going to be made in the mobile map package so users can view those changes on the map.
Thank you,
Mike Hamsa