Originally Posted by MikePerham 
On my K10D you simply use your thumb on the OK button and fore finger on the front dial to change ISO which can easily be seen on the LCD ...what could be easier?
My suggestion would be easier.
A dial for each of the three primary photo parameters so they can be seen and set even when the camera is off. Perfect affordance. No dials that do multiple things for such important functions. No need to set a parameter in one place and read it in another. An Auto setting on each that gives control over to the camera. No need for special modes.
The perfect interface that in some ways borrows from the ultimate in film bodies.