I know, but you must be able to position yourself as a hosting customer.
most customers will not remember the password to login control panel, even when still on cpanel. talking is easy but in reality it's not that easy
If they do not remember the password to login to DirectAdmin, it would not help them anything to have autologin to phpMyAdmin.
Also our customers is shared hosting customers, so I have no problem to position myself as a hosting customer - I give our hosting customers support everyday.