First of all
You are talking about Trigger ms etc so a Semirage config or legit config?
Second
It has to be done through the menu but also sometimes possible through the config file if not encrypted, btw you won't have source code access to any cheat that cost money so no idea how you got that Idea
Third
Testing,Testing,Testing and Experience is how you make a good config.
Fourth
Nobody really buys Configs at this time since its wasted money, maybe for hvh configs in csgo or so but cs2 there is no real reason