I like this system but I do have 1 question...

I want to have 1 login and be able to add email addresses for a domain and add a domain and change hosting plans and everything. It appears with the default setup you would have to login to 3 different areas in order to access all these settings.

I also want to maintain the domain user so that clients can login and make changes to email passwords and things.

Let me know if there is a way to change this to make it do what I want.

Thanks in advance! Great work!

Have you been taken a look at the demo ?

Because the functionality you're asking for is already integrated...
You can change into every user's interface from within the admin account.

So you can look into reseller accounts and client (domain - user ) accounts.
Your customers may edit their settings on their own with their own login and you may help them without knowing their password, because you can switch into its account through the panel.