We use our own carriers as the standard carriers do not ship our kind of product. Our carriers are normal vendors in Books / Inventory, which allows us to use all the billing, payment etc. functions of these apps. However this does not allow us to use the shipping features on the system, as these are for pre-configured carriers only.

Would it be possible to add the ability perhaps under the "Ship Manually" option to use pre-existing vendors and an email facility for shipment orders? This makes the system much more flexible and would enable users like us to use all the features.