it would be great to have more options to categorize products on the simple store, 5 categories is quiet limited. Objects can have so many variables that customer can browse and select. A search button would also be quiet helpful to search through lists of products.
Glad to inform that you may add more than 5 categories on the products of our Simple Store. We also have a "Site Search" that can be enabled on your site. Both features are available to our Pro users. Cheers!