I must not be the only person that needs Subproducts listed with items to have varying quanitities.
For example if you have one toy car, that has the subproduct extra wheel. You want to include 4 of those extra wheels, but they are all the same SKU. I'm not sure how you would do that without having to create different SKUs therefore messing up your inventory, marketing, and financial records.
edit:
These Subproducts have a set number of quantities not to be changed by the customer. It is a set Kit, with components.