Linking to an external billing system is easy, I agree. That’s how so many billing systems (good and bad) can build around cpanel as their platform. It’s not integration, though, far from it. It’s hack and slash.

Thanks for clarifying my point on multi-domains. Multi-domains, in my opinion, is the ability to manage multiple domains from a single login (not one login, then another few screens, then multiple additional logins underneath that). If you have to use a ‘way around’ to accomplish something, it’s inherently flawed, in my opinion. There’s also limitations when logging in under a reseller or the root user.

cPanel, as I said above, is a great cp for what it is: single server, single domain.

As for managing multiple domains via the cPanel interface, I do this quite easily by acquiring/setting up a reseller account and using the drop-down box at the top of the cPanel interface that I see when logged in as a reseller to switch among domains.

Impressive stuff.