Batch changes on the sales order and purchase order modules would be helpful for applying the same consignment number and courier selection to multiple orders. 

Quite often it is the case that multiple sales orders for the same customer are despatched on the same consignment number.

It would also be useful to apply the same delivery due date to multiple sales orders in batch changes. For example when there may be call off orders where one sales order relates to multiple invoices, there may also be multiple sales orders for different items on call off. So applying the same delivery date to more than one sales order at a time would greatly improve order processing speed. With the same applying to purchase orders. 

Overall, allowing batch changes for customer/supplier order numbers, delivery address, notes, incoterms, custom fields, carriage details, sales order due dates etc would improve efficiency.