A useful enhancement would be the ability to apply settings with a keyboard button. It would be great to be able to through a series of selected settings with a button. For example, some rotations I would find useful would be:
A button to rotate decimal places to 2, 4, 6, 0 and then back to 2.
A button to rotate mode through normal, fraction, engineering, and then back to normal. I’d skip scientific and accounting, but some people would want to include it in their rotation.
Another thing would be the ability to set a button to switch layouts. With a similar keys in each of the ring of layouts, this would effectively be a rotation — say, from a decimal to a hexadecimal layout with A, B, C, D, E, F keys and back.