User´s special product discount

[yuridek]

This a better approach to another request that I made earlier.

I need to implement a special (Quantity) Product Discount, but related to a specific user.

Here is and example:

My Cart:
10 Kilos of Deer Meat (This Product applies for a XX% discount, just for this client)
3 Kilos of Boar (Not applies for a discount)
1 Kilo of Ostrich (Not applies for a discount)

In the example the user is doing just one purchase and the discount is applied only to the Deer Meat product and not to the entire buy.

Is this possible?

If is not possible…
There are some plugins that can enhance this functionality?
Could be possible to implement this in future releases?

Thanks very much...