Marketpress: Is there a way to add a downloadable products as a variation? Also, can you take shippi

I am doing a store for video products. Each product can be bought either as a digital download or as a DVD, however it seems making a downloadable version a variation is disabled. Is there something I can do in the code to make this possible? For now, I have just separated them by category. But then another problem comes up, the same shipping costs seem to apply to all the products, but I don't need them for the digital products. Is it possible to remove shipping on just the download category? Thanks so much for your help!!! :slight_smile: