AW2K is missing support for the ebay store Good Till Canceled (GTC) option. Until it arrives store items can be listing via manual method, then changed, however it would inevitably pose the second issue:

Buyer purchasing a second time from the same listing...

Yesterday I had a buyer come back to my store item and purchase the same item he bought a week ago. I was thrown for a loop when I had a purchase notification but no invoice generated.

Also, I like to give a discount to return customers.. any way a % off function can be added?