I too would really like to see this feature implemented in GOS. It's been discussed to death on so many forums (including many other threads in this very forum). And more and more OEMs are including a "battery protect" like option in their devices.
I can't imagine it would be a lot of effort to implement this as part of GOS itself, so those like us who would like to use this feature, can. Everyone else can keep it turned off if they so choose!
Why is this still something being discussed?