Manage Sub User Account

I am looking for access to a specific environment and I thought i'd put it out there and ask y'alls if you have seen a good way to achieve or a reseller that would let you...

a. Use whmcs to auto create accounts (yes, ino, very likely in most cases)

b. Manage all the accounts from a user that has access to all the webroots.

Im looking for a setup that lets me autocreate an account so a user has access but lets me use dreamweaver to manage all the sites in one session. I've found either or, but not together.

I thought about buying an instance of cpanel or lxadmin but im tentative to move away from a guaranteed uptime and backup solution that comes with a reseller environment.