This will be a problem and won't make your life easy ... So what will happen in this case ?
- root can't connect to any compute node without password using ssh (including the installer-failover)
- cfmsync will not work
Good news, the content of the .ssh directory for the root account (on the installer) is stored here: /opt/kusu/etc/.ssh_installer
So just copy over the content of this directory into your root's .ssh directory and everything should be fine (please post a comment if this is _not_ the case !)