I got back at the computer and I was able to test it.
I confirm it works. You can now add moustache notation to include a SC binding.
Previous to 4.9.0 this wouldn't work.

Now it does. @George this one is missing the picker icon.
So that data is written/read from app/config/config.json

And Patrick recently added
Parser.parseValue(config, new Scope({
$_ENV: process.env
}));
To the config.js logic to parse the data which previously was just static.
This means that app/config/config.json and app/config/user_config.json are now parseable. More about the latter here: