First, let me say I love this app so much. I use it for everything.
One thing that would be great though would be a public API for interacting with it. I have to track more stuff about given shipments than can be just in the app, so I have a spreadsheet which is my primary data source (but doesn't include status of shipments). I wish I could write a script that would just sync my spreadsheet with my Deliveries app. That way I could put new entries from my spreadsheet into Deliveries, as well as mark rows in my spreadsheet complete once a delivery is complete.
A simple REST API would do, like: