Is there anyway to set a minimum quantity of a product so that if the customer has not put enough into the cart, the shipping will not be added and they can not checkout?

The reasons I ask..

I have set up weight method for shipping and this seems to work fine, if customer selects correctly.
I've seen that if they exceed the weight on a certain method, correctly the shop brings back a message saying that they've exceed the weight.

I have a set delivery rate per box which is same for a box of 6 bottles or 12 bottles.
I state a min. order of 6. and then customers can also buy in 6 or 12 multiples thereafter.

I have set this up so that the cart knows when the weight goes over the 15kg(1 box) to charge for another box. That's o.k. to a great extent but it really needs the customer to check that they are adding in multiples of 6.

I want to be able to set a min amount of total products in cart to 6, so that if they checkout with only 4 added, the shipping will be correct, but the minimum amount wont be reached.

Ideally a message flash up with

I know that we can set the amounts for each product to a max. which works fine if I only want customers to buy multiples of one product i.e 1 case of 6 of the same, but they should be able to ALSO select individual bottles and make up their combinations of either 6, 12,18,24 etc.

Does anyone know a way round this or would I need someone to change the code somewhere?

Apart from setting the minimum quantities for individual products, there is currently no practical way to set a minimum order quantity or value. Later versions may have this facility included, as the checkout and shipping does need further tweaking to allow things like offering free delivery over certain order values etc as well as allowing input of discount vouchers where applicable.

Has there been any updates regarding Minimum Quantities since last year?