When the color picker is opened, the red field is automatically selected. It's very, very rare that I'd want to copy the red component of a color. However, I copy the HEX value very often. Usually it's to copy a color, then paste it into another picker, like when I'm copying a shape's fill color.
It'd be great if the hex field was automatically selected when the picker is opened, saving several clicks (four clicks when copying and pasting a shape's fill color).