Marketpress categories and subcategories

Why does marketpress not support multiple heirarchies?

If I want to dvide the shop in to three basic types and and have similar sub categories underneath them, the plugin does not support it.

eg.
The product url of a product category Category 1 > sub-category is
xxx.com/shop/products/category/sub-category
It should be
xxx.com/shop/products/category/Category 1/sub-category

The product url of a product category Category 2 > sub-category is the same as if in Category 1
xxx.com/shop/products/category/sub-category

Why are the parent categories removed?