If you accidentally add the wrong item on a customers' order, or if they change their mind about something, it would be nice if there was a simply delete button on each order line.
Currently the only way to do it is to set the Qty to 0, then press save, then refresh the page to see the deleted lines disappear - a very cumbersome process that could be made simple with a simple delete button and a prompt saying "Are you sure you want to delete this item?"