Upload & Sell: On
Rename on import HH.MM.SS.MM.DD.YY.
Rename again at the end of the job. (ie: "Client_W_001.jpg, etc.")
Win should not be changing anything. What are you importing with? You should just copy them to the drive manually; then import.
I use the card reader in my computer and import one card, them the other. I don't change anything but when I look at the folder with all the pictures, when I sort them by date created the ones from the first card show first followed by the ones from the second card. Windows changes the creation time and date to the copy date and time.