The numbers do change, unless you happen to have picked solid black or solid white, in which case the brightness/luminosity will make the RGB values 0,0,0 or 255,255,255 regardless of hue and saturation. That's how color pickers work. As for alt-o, it's the hotkey for the Color|Solid box (swatch). Nothing hidden anywhere. No, it's the hotkey for that hidden button mentioned in the original post. The o may be underlined in there, but if you hack the window larger, clicking that button will have the same effect as pressing Alt+O.