An option to turn the screen brightness and reduce the blues/color temperature at night. This feature has become ubiquitous on phones, tablets, and computers now. Lots of people use the GO at night and this would be useful for preventing sleep disruption.
Darshan Gayake commented
Brightness can be reduced via toolbar under settings option and brightness sub menu there is no way though to change color temperature.
I am not exactly sure what is taking them so long to implement this. I asked John about it back during Go launch:
Then during OC5, I was happy to hear him say the following:
It has been three months since then and there is still no setting in sight...