Sales Orders
Under Sales order line ->  Copy from customer will lead you the "Copy from all form", but now by default filtered on the customer. This allows you to quickly copy lines from a previous sales order.

Return Orders
In some industries the items are already returned before the lines are invoiced. Under Return line - Copy from customer this will make it more convenient to get the right line price and discounts to the return line.

Quantity no checks

No checks are done regarding the quantity, the checks are only available when copying from invoices. Therefor both menu items are controlled by seperate privileges.