Vibrations of the SC3 are in fact vibrations of your phone that are ‘physically’ transmitted to the SkyController 3, then your hands. No vibration mechanism is build inside the SC3.
Vibrations of the phone occur when a warning message is triggered in FF6 (such as low battery, strong WiFi interferences, strong wind, Britney Spears singing...)
Recent addition of new warnings (strong magnetic interference, auto-landing due to battery level...) should induce vibrations more often...
The blue light cannot be changed into green. Recent regulations change in the French rules (and probably European EASA rules) do state you should not use white and red lights to avoid collisions at night because red and white are used by aviation.
As red and green is used by airplanes (red on the left wing and green on the right wing) to help figure the plane motions at night, I wouldn’t be surprised if they also ban the green lights.
For instance, I would stick to the blue light (do you have a specific reason to change this ?)