My old Sony Ericsson phone has that flash light function also, even has the SOS mode. I wish the BlackBerry can do that to. May be with an application that can control it.
Right now all I can do is set the light ON in video mode, so whenever I turn on the video camera, the light is on. But, I think it would kill the battery soon since both the screen with motion and the light are on at the same time.