Max numeric value

Hi,
Great module. I have customers with attributes that must be numeric and this helps a lot.

Is it possible to add a new feature for max numeric value.
e.g. if the customer can only be a value up to 100 but not above.

I have customers where the price is calculated from attribute values and if the number given is too high, they want to stop "add to cart" i.e. validate in the same way as numeric until a valid number is given.