stock Item in quick2Cart

Hi

I notice in your Quick2Cart demo that you can buy an unlimited number of any item even if the stock item is set to 2, is this a bug or something I missed

Also if I am selling an Item with 3 different sizes and I have 2 small, 4 Large and 10 Medium in stock, is there any way to set a stock limit for each size or do i have to create a different product for each size

Thanks

William