You do know that the colour picker in OSX is in OSX, not Rhino. It is the same for any program that doesn’t use their own colour palettes, like Adobe. You can actually run the colour picker as an app and it will look like your screen shots.
Different from the Win Rhino colour picker.
Quoted from the following link, "Most modern OS X applications support the color picker, but for those applications who are in the dark, you can use a little AppleScript trick to run the Color Picker as its own application.
Open up the AppleScript Editor (inside the Applications ? Utilities folder) and type in the following code:
Then save this as an application. Now when you run it, your traditional OS X color picker will appear. Drag and drop colors around to your heart’s content!"
Taking Charge of the Color Picker