How to use term_group for ordering subcategories in Wordpress?

Question

I'm looking to customize the order for subcategories listed in a navigation bar in Wordpress. The codex makes it clear that there are five ways to do this: http://codex.wordpress.org/Template_Tags/wp_list_categories#Parameters. I am limited to two: 1) prefixing each category with a number and 2) using term_group. The problem is that the Codex seems to be pretty vague as to how to make use of term_group as it only describes it as a group of terms. I know that a category containing the word, "video," always needs to be placed first, a category containing the word, "roster," always must come second, etc. Is there a way to achieve this without prefixing the slug and possibly using term_group?

Answer 1

There is a plugin that does that:

http://wordpress.org/extend/plugins/order-categories/

Answer 2

Just to give an update: (today is August 17 2010)
According to a couple of users ("Compatibility") it still works in
Wordpress 3.0.1 using the plugin version 1.0.3 (Last Updated: 2008-5-30)

http://wordpress.org/extend/plugins/order-categories/