User:What user are people going to be "auto" logging into phpMyAdmin and Webmail with?
Like in the User Side of Cpanel. When you are already logged in you can be automatically be taken into your email account. You can also go to the email area and choose an account and it will just open for you. It knows the password you set for Webmail or PMA. Since you already authenticated to the Panel.
Same with going to PMA inside the user side of cpanel. You can just click on PMA and it opens. All because you are already logged in.