Perhaps for what you're wanting to do, a mix linking the throttle to the steering dual rate is what you're after, but looking at the manual I'm not sure that is an option (I've assumed Sanwa based on your previous posts and menu item names).

I think if you linked the steering to the throttle or RPM telemetry like this, the car would gain steering as you slow down and create a bit of hooking effect as slow down to turn.

Maybe a better way to do this would be to make a custom curve for the steering? Set the movement around the centre to be less sensitive but to still allow full travel if you turn to full lock.