First, you'll note that when you view Configuration->Maximum Values that it shows a URL like:
Code:
http://www.example.com/myadmin/configuration.php?gID=3
So 3 is the configuration_group_id value and you'll create a SQL script similar to the following which you can copy/paste into Tools->Install SQL Patches:
Code:
INSERT INTO configuration ( configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added, use_function, set_function)
VALUES ( "The title of my new value", "A_UNIQUE_KEY_TO_IDENTIFY_THE_VALUE", "No", "A description of what the value is and what it controls.", 3, 40, NOW(), NULL, "zen_cfg_select_option(array('Yes', 'No'),");