Using the analogue for gestures is an interesting idea. I'm sure I've mentioned to you before that in my work I've spent a lot of time looking for deeper ways in which players can express themselves to the machine. For my current game players will learn to speak a language, converse with npcs etc. The idea is the same.
You have this really expressive way to communicate, with all these rules and context sensitive meanings. You roll them out to the users, and teach them through mechanics, then as they learn they get better at expressing themselves. What becomes a long thought process becomes automatic, and is used as a building block for more complex expressions.
I haven't spent time coming up with the most natural way to get ideas in through a controller. Using slight mouse movements, nuances in button press timings, analog gestures. All fair game.
Yeah I remember, I'm truly waiting to see what you will come with
Do you know game like sweaty palm or the act? they try something like that you should check.