Option you are talking about is inactive in osclass, it is checkbox without any function and is removed in 4.1
1. There is one-way communication, your site is checking for updatrs on our api via json, if available, your site downloads it and install.
It does not work in oposite way.
2. Only open-source scripts has future, it does not make sense to change it
3. From version 4.1 you will be able to enable auto-updates and restrict if major ir just minor updates can be automatically installed