The cart supports multiple product image if you setup product attributes you can associate a product image with each product attribute. On the product detail screen the user changes the product attribute the image will change. If you dont use product attributes then the cart supports 2 images per product a thumbnail on the product listing page and a large image on the product detail page. What page do you want multiple product images to be displayed on product list or product details? We will add to the dev list.
Yes we are adding new features to the cart everyday.
Currently, the cart does not have a product clone feature we will add that to the dev list as well. In the meantime, if you are comfortable with it, you could cut and paste the product you want to copy in the smith_products table in sql server that will save you some typing if you want to clone your porducts.