Rick,
The rolled single luff flattie was very popular in the 60-80s on skiffs.. Especially skates and VJs (both not technically a skiff but sharpie hulls).. Believe some of them still use them..
Ease of use fantastic..
ultra quick on shy reaching..
gives way to a fuller genacker on deap runs..

I dont believe either of the rules bans roller-furling the kite.. But then I could be wrong..