Limit e-mails per hour based on account vs domain

Based on How to Set Email Send Limits - cPanel Knowledge Base - cPanel Documentation, it states the hourly e-mail limits are domain-based, not account-based. I've tested this out by sending enough emails to hit the limit and then creating an add-on domain and I was able to send additional emails through the new domain. Is there a way to have the hourly e-mail limits based on the entire account and not based on domain?