Don't tell it to, and you'll be fine.
If you use a car dock, DailyRoads Voyager is awesome. It is a "black box" app that can record video in the background along with all sorts of other data (speed, GPS, etc.) in the event of an accident/incident/whatever.
You can customize it however you want (length of video clips, how much video to store, when to automatically save video, etc.) For example I have mine set to record in the background in 720p automatically once docked (and to stop automatically when undocked), with a clip length of 5 minutes, storing the most recent 3GB of video (which at ~1MB/sec ends up being about 50-60 minutes of video) and to automatically save video in the event of a G-force of 3G or higher.
And it's free, amazingly enough. The only bug I've noticed is that you can't watch YouTube videos while DailyRoads is running.
it lets me install a service that turns on the LED when i shake the phone at the lockscreen. pretty customizable too! saves alot of time getting to the flashlight app and hitting the button on the screen.
just unlock and shake and the LED lights up. also u can set a timeout for the LED to shut off in case you leave it on or it turns on in your pocket. ( I set the sensitivity too high with another lockscreen shake app and my pocket started getting HOT from the LED)
typed with my fingers...