Ability to Update the eBay Shipping Policies (mainly Shipping Policy) via the Api

We'd like the ability to update the eBay shipping policy via the API. With eBay you do import and store the Business Policies in the integration pages but we can’t update them via the Api. We are having to use the file import/export when stock moves between locations to update the Shipping Policy to tell eBay items which can be sent same day/next day. Since you updated the Rest API with handling times we can actually update the handling time on eBay but this needs to be used in conjunction with the Shipping Policy to have any effect on the live eBay listing