Yes, I have. While not exactly what I'm looking for, invoking sudo -i does seem to come closest. Using that was how I confirmed I'm using the correct password for the root account. That's why it seems so weird that I can't log in to the gui as root.
I started fooling around with Linux about 20 years ago, after I bought a Slack CD on eBay. My idea of fun used to be setting up mixed OS networks on the weekends. 
Currently, I run a mixed Mac/Windows/Linux environment in my home.
Love SPM!
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