[Plugin: Better Tag Cloud] Exclude a category tag

I have the option “Add categories to tag cloud?” turned on, but would like to exclude some categories (mainly parent categories that have children) as these have two many associated posts.

The “Exclude Tags” feature works with tags, but doesn’t seem to be working with categories, I am assuming the filtering is done before the addition of categories.

Anyway to add this as an option.

http://wordpress.org/extend/plugins/nktagcloud/