1) is there a way to have the screen stay on while plugged in to the charger and time out when not plugged in (automatically of course)? 2) is there an app available that i can easily change the settings on my phone to bare minimum to preserve battery life when i'm away from any chargers for an extended period? like if there were 2 settings and i can toggle back and forth between them when i'm in the office and out on the road. thanks in advance for any help! aloha.