edit shortcode, choose one tag?

I really like the plugin (pro version), but I wish there was a way to edit the shortcode so that we could have the portfolio already loaded with one selected tag instead of all. For example only “commercial” or “film”, instead of “all”. I am aware that the option to choose the default selected tag exists, but I want to keep it with “all” selected. I just would like to have the choice to create links that show only one portfolio’s tag. I guess I would need to re-create different portfolios with just one or a few tags, but in this situation, there wouldn’t be the choice to click back to “all” or to other tags… Or maybe there is a solution but I don’t know how to edit the shortcode? The page I need help with: [ log in to see the link]