That’s a feature I would love to see too. Here’s a typical use case: we do a lot of work for oil & gas companies in the Middle East and very often there is not even a mobile signal in the workplace. It would be great to write up a work-log or minutes of meeting and add it to the Docs section or update a to-do list in the Basecamp Desktop app on a laptop or tablet and then have it sync up with Basecamp in the cloud when access to the internet is available again.