The color picker for the gradient map adjustment seems to be missing. The ability to pick tones from the image for the gradient map, without having to write them down and manually adjust to the RGB numbers, would be awesome. It's an extremely powerful approach to color correction in Photoshop, and the feature seems to exist in the desktop version...
If I'm wrong please tell me where it is, I can be very blind sometimes. Thanks!
EDIT: Double checked to see if I was crazy, doesn't seem to be available for the color studio/panel for any of the layer fx either...