VirtueMart Min/Max and Multiple Values

I need a modification for VirtueMart that will do the following: * set minimum and maximum quantity order rules for products. When the customer selects an out-of-range amount, the quantity is adjusted to fall within the permissable range and a non-fatal message is displayed telling the customer that the quantity was adjusted. The store owner can configure the text in the out-of-range message box or leave the box out of the store altogether by deleting the override message text in admin. * set quantity multiples You can change the quantity input into a drop down select list with multiple values. For example, setting the multiple to 2 will result in a select list of 2, 4, 6, 8, etc, setting the multiple to 5 will result in a list of 5, 10, 15, 20, etc ... up to the maximum. You can also make a non-equal interval, e.g. 1, 3, 7, 10.