I too am interested in this option as well. I have 25 T-Shirt colors sized XL. 25 T-Shirt colors sized L, 25 @ M & 25 at S.
I want the customer to be able to only order a maximum of 12 T-shirts at a time. These t-shirts can be various qty for each color and size, just cannot go over qty 12 in the cart at checkout. If they choose to go less, I only charge them a per unit fee.
However, my store also contains shorts and hats. When they max out at the various colors and sizes 12 T-shirts, I still want them to be able to purchase any given number of hats or shorts at the same checkout.
Hopefully someone can assist due to client imposed deadlines.
Magento work-around options or module suggestions are welcome.