I feel it is about time that sellers had a facility to mark more than 1 item as shipped at the same time. It is a real pain having to do them 1 at a time.
Also from a buyers point, the ability to mark more than 1 item as payment made would also be a great feature. I have just had to do 10+ items as seperate mark as paid.
These features would be very good and save a lot of time.