GridMarket + MarketPress + Product selection

I am using the theme GridMarket and plugin MarketPress. Can you tell us if there is a way to select what products can show on the GridMarket homepage. Currently we all know that GridMarket show all products however is there any way to filter what products can show. For example on the home page we see all products. Can we fix these to only show products from a category? Something like when we use shortcodes like: [mp_product_grid category="index"]

Please tell us all what files we need to edit to do this. We need the code to replace and the code to add.

Also Can you please create an update for the Framemarket and GridMarket themes with these options