Originally Posted by
LumberJack
Can't remember the source but I remember the justification was something like Flaps 1 gets you most of the performance of any flap setting.
Precisely.
It might be sluggish getting into the air but having the leading edge devices out should be enough to keep you from stalling. Should allow for a safe takeoff unless you have the exceptionally bad luck of losing an engine on the takeoff you happened to incorrectly set the flaps. Still, I wouldn't suggest anyone press to test.