As for your first question, I don't quite see the admin use for a technical run down on how ez publish creates a page. But if the ez crew finds the time?!
Well, you are right about the term section. Site sections are used for design switching and permission control. The template function (operator?) section is used for various tasks in the control of the templates.
Find some more info on templates here: http://ez.no/developer/ez_publish_3/documentation/ez_publish_3/terminology_basics/template_language
There is an overview over all template functions in the sdk (linked from the above).
An overview of the template process is interesting but at the moment we don't have the time for this to make the 3.1 release. We can look at this for later 3.x releases.