look into optionally disabling screen sleep
For engadget who say "Doesn't keep the screen awake" http://www.engadget.com/2011/05/06/app-review-planetary-for-ipad/
http://forums.macrumors.com/showthread.php?t=918375 says:
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
Worth a go? We should make this an option though.
See also http://stackoverflow.com/questions/2221868/how-to-stop-mpmusicplayercontroller-from-enabling-screen-locking
Apparently the setIdleTimerDisabled call doesn't play well with the music player.
Closing this, it's not going to make it into the next version.
Re-opening this because it seems more important than I thought. I realize now that the app only stays awake for me because I'm always testing while connected to Xcode.