>> For phpMyAdmin
http://www.webuzo.com/wiki/Category:FAQs#Password_for_MySQL
why keep it in this place , may be you can allow to change it from GUI or you can keep it the same as the login password for webuzo or you can atleast not ask the user for login details when he wants to log in to phpmyadmin
>> wordpress so that it can easily be upgraded
You can upgrade Wordpress  by a click using Webuzo
https://www.softaculous.com/docs/How_to_upgrade_installations
its not only about upgrading wordpress , other themes and plugins can also be upgraded so that is why it is required
>> FTP Users
http://www.webuzo.com/wiki/Add_FTP_User
i tried but the problem is cannot seem to log in via ftp , there is no port no. mentioned .
Hope this helps