You can also use some of the features in this article to blacklist as well. ;)
https://client.buildzhosting.com/index.php/knowledgebase/51/How-To-Whitelist-Yourself-In-WHM.html (https://client.buildzhosting.com/index.php/knowledgebase/51/How-To-Whitelist-Yourself-In-WHM.html)