I agree with the OP in that....
It is a very small area it zooms in on and takes time to know where you are, and composing you can't until you half press the shutter. So it maybe a user getting used to it also. I know I am not. So switching between the shutter button and focus ring needs to dance around much the way it is now.
I think it would be a great and a welcome addition....Another thing they can do, UNLESS this is already the way it works, is, to make the ring control allow how zoomed in you are. this way its clearer where you are focused. So as you use the lens focus ring, your thumb can be zooming in and out. This to me might even make more sense, so there is no switching, just seamless multiplier from frame to 12 or whatever the max is.