I'm using with these plugins:
http://wordpress.org/extend/plugins/gd-taxonomies-tools/
http://wordpress.org/extend/plugins/gd-taxonomies-tools/
Works great.
Now my question. What is the meta box in the right column, titled "Simple Fields" for? I understand the function of "Show custom field keys".
But, what is the drop-down for when I've already set a default for the field group I want to appear in that post type?