I have never used the screen blancker feature. Also, I like it theoretically :), meaning that if I ever decide to use it I do want to be able to set the sensitivity value. BUT, I would definitely ADD an option to have the screen saver start only when in pause, because that can be useful too, and actually I may consider using it with that.
Lets' put it this way:
If I used to leave my empeg with a static screen on for a long time, I would want a screen saver, and I would like to have the sensitivity adjustment function there. But I never leave the empeg with a static screen on, so I don't use. It is also true that when I pause the empeg I don't care about the info displayed, so in that case the screen saver could be useful. I don't leave the player in pause for long periods of time, but I would enable the feature, "in case i do sometimes".