Allow Google Tag Manager (GTM) to be use
Allow smugmug sites to use Google Tag Manager (https://www.google.com/analytics/tag-manager/) as well as Google Analytics to allow the flexibility for individual sites to integrate multiple other analytics vendors.
I agree that this needs to be something that we can control or add. Google has changed so many things on how they find us on the web besides SEO. I can't add any HTML/CSS to the code of the body that Google needs to verify things too.