- Default settings you will find in the Program Files(x86)\checkmk\service\check_mk.yml
- py extension is absent to simulate the behavior of the agent 1.5. Probably, this was not so good idea.
- In 1.7 we will change this, of course(as Andreas mentioned already).
And your proposal is absolutely correct: The text is not clear
- I will fix texts in 1.6/1.7
- Introducing py extension in 1.6 by default requires an approve