WHMCS is a powerful piece of web hosting automation. However, sometimes a few tweaks to it's core functionality can make it better suited to your business model. We've been working with WHMCS for almost 10 years and can make it do pretty much anything you need it to do. We've even built two factor authentication systems for sub accounts for one of our customers.
We're available to create custom integrations with domain registrars, VPS platforms, payment gateways, data analysis tools and much more.