Tartan Giant.
I was taught to do this on my conversion to both the F27 and FH227 by Belgian and Finnish instructors respectively.As I recall it was recommended for wet/icy runways and although we certainly had wet in Africa the only ice around was in my brandy and coke!
I can't comment on the certification requirements and as by and large we landed on enormous runways can't say the benefit was noticeable. It was also SOP on the Citation I flew and it probably did help as we had no reversers. I never worried too much though as we had the Drag Chute fopr really scary moments!!
Cheers