Ability to use admin credentials for Migration Manager
Using root password is not secure. Using SSH key is not comfortable.
Destination Plesk should connect to the Source Plesk with admin credentials and send a temporary SSH key to the Source server. This key can be than deleted after migration. Or for more security admin of Source server can generate a one time password only for migration.
Thank you for your input! We will consider this functionality in upcoming releases if it will be popular. Everyone, please continue voting for this feature if you consider it important.