Mark from Miva Merchant posted a pretty good primer on Store Morph Technology (SMT) for Miva Merchant.
SMT gives you the ability to manipulate Miva Merchant on a page by page basis. You can change virtually any page within Miva Merchant and manipulate the dynamic data that is displayed with the use of conditionals and variables.
Check it out here: Miva Merchant: A Store Morph Technology Mini-Primer