Stock management/ linked product does not work correctly

On your demo site, I am testing the functionality of adding a linked product to manage the stock.

This works with two separate orders however, if I was to add multiple of the same configurable products to the cart in the same order, the stock will go into the negatives.

Also is there a future possibility of adding more features to the linked product instead of just stock. For example, linked price and sku?

Many thanks.