Im going to base this on my current dilemma eParcel is too expensive, sendle doesn't fit well with ebay's requirements and couriers have a parcel lost rate that is too high for me to take so im left with MyPost business, which of course has no API that is directly accessible by a third party program.
My current solution is a custom order export (exports all pick orders) which i then have to manually edit to merge multiple products to the same person and then change the dimensions from meters to centimeters. Tedious process but thankfully all my dimensions are the same.
What i am suggesting is an extra button in the orders list options when you select an order or multiple orders it can use one of your custom export templates with the selected orders regardless of the current status.
And for the export template i would maybe suggest having an option to merge multiple orders instead of looping through each item as an option as it could be very useful.
Unless its already done i really dont think this would be too hard as i made a local type of MyPost csv formatter in liek a day but i couldn't maintain it because i needed something with proper address validation (neto)