Hetfield, we used to do the same on long runways(BAH) but use 15/15 now.In fact I cannot think of anywhere we do this,but we do put them away at night!
Many years ago we had an aircraft damaged taxi-ing in on a contaminated surface across in the US.It damaged the flap mechanism.However somewhere during the telephone call to engineering this translated into slats!!The engineers turned up with a big spanner for the slats and the rest as they say is history!!