Regading the app that keeps your screen unlocked(no swiping home screen to unlock, and just tapping side controls wakes phone up right away,etc). Does anyone using this app know if using it sucks up addtl battery life? Is the phone perpetually on and never sleeping? I've been using this app since for a year, and just NOW had this question pop in my head......I stopped using the last couple days, and can notice a SLIGHT improvement, but still can't be sure. Any ideas, ladies and gents?