It can be disabled under gestures settings (on stock rom at least). The feature is one of the primary selling points (special features wise) of the phone and it's apparently well-optimized in its design (either in Kernel, or hardware, or both). The G2 also has that 3000ma battery to begin with. So battery life is definitely not a concern here.
Last edited by ilovecats; 6th March 2014 at 03:01 AM.