Couple of things.
1) When receiving in serialized inventory default the quantity on the add consecutive number to the qty of the PO. This defaults to 10, I always have to change the field to the correct number.
2) When invoicing have a check box to select all of the serial numbers. I have had times I sold 100 items to one customer. I had to go select each check box next to every serial number. I would have much rather clicked a box to select all and if there where a few extra serial numbers, unchecked the ones not sold.