Rather insightful on (2) with regard to:

    > ... we need to start protecting against the person in front of the device

My first thought was, "Oh, God, please don't". I'm a parent, if I put that software on the computer it comes with rules not to touch it; if it's touched, they know I'll probably find out, ban them from it for a bit and return it to them locked down in a manner that when I return it to its original state, they won't touch it again. :o).

But then I thought of the other common reason this kind of capability is added to software -- are you preparing for the eventual future where you will have to do this, not to protect from a child removing the software, but to protect from another app surreptitiously removing Portmaster in order to bypass its protections?