I personally Run the Futaba 3pm and the Dual rate switch is located just on my thumb of my trigger hand and I find I can only adjust it down the straight and even then my attention diverts and I stop steering properly and can never get a fast lap while changing settings
But I can change them so that's ok too.
I would like to see something easier to switch or automatic as no matter what you do on low traction surfaces you will need more steering over the course of a race.
Cheers