Thanks for your patience with this idea! We have started work on updating our ShipStation Connect codebase. I'm checking to see if this will allow what you are asking for and will follow up with more details as soon as I know more.
The work we are currently doing to update ShipStation Connect is a step toward your use case, but the first phase of the Connect updates don't include this ability. Implementing this will bring up some new complications in how we manage the front-end experience, which will require some research and testing after we've implemented the new code base.
That may mean we reach out for further input from interested users and even create a test group. If you are interested in being contacted for this in the future, please let us know in a reply. Thanks!