Guess what, I am trying to solve this problem and in the process have discovered something in functions_general.php:
function zen_get_uprid($prid, $params) creates that unique "productid & attribute mix identifier" that is inserted into the cart.
function zen_get_prid($uprid) is used to extract the product ID from this identifier, but can be adapted to take it apart if necessary.
This could be a perfect way to define a unique product/attribute mix to be put into cart with the "single click URL" feature of Quick Order.
You can see the actual use in actionAddProduct in includes/classes/shopping_cart.php
I know, I know, you are thinking "if you are such a smartass to have done all this research, why don't you make it happen?"
Well, because I have never written more than 6 lines of PHP code, and this one would effectively require one to create an admin version of the cart - with the "product+attribute mix ID" field...
I just hope someone ;-) will find this useful and just GOES FOR IT
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