That's a pretty cool App.
If your purpose is to save battery, you might look closely at how much battery the accelerometer monitoring uses.
It might be tolerable if you use it with display on (which would allow to turn screen off when you set it down).
I wouldn't want to leave accel's running when screen is off. The fact that you went into settings makes me worry that you adjusted your accelerometer monitoring to "yes". Unless you really really really need that screen to turn on when you pick up the device regardless of battery cost, I would suggest to leave that accelerometer setting to either "no" or "when power connected". You'll still be able to use it with screen on.