Wondering if this can be accomplished? It may sound silly but we can have a scenario where a customer would like to return an item for an exchange (they made a mistake on an order) and will pay for the shipping it back. Before they can ship it out, we have to generate an RMA# for the return - tracking and processing purposes. And later when it gets to use we send them an exchange for free of charge.
This scenario doesn't seem viable in Shipstation today - to generate a return with simple RMA# and no label. It may not have a direct value for a shipping service provider but I think it has a value for order and inventory management.