I make my own MMf and I make my own gumpaste using CK powdered mix. My question.... has anyone tried to mix the gumpaste mix in when making MMf. I am going to try this and see how it works, but I was just wondering if anyone else had tried it yet.

I've had the two made up and mixed them together that way which was fine, but never just add the dry mix when making the mmf. Let us know how it turns out.

I will let you know how it goes I off to make it now.

Check out this CCer's blog post explaining how she does just what you're asking about, and if you see her adorable cupcake toppers, you know it works great!
http://thefrostedcakencookie.blogspot.com/2009/03/sculpting-marshmallow-fondant-recipe.html