FYI: Flick half rolls are allowed in the DG-1000 (18M).

BTW: There are many gliders which are certificated
for some acro
figures: ASK-21, DG-500, DG-1000 just to name a few.
All of them have
T-tail, none of them is primarily an acro glider, all
are cross country
gliders which just happen to be allowed for some simple
acro figures,
and, you guessed it, none of them is certificated for
flick maneuvres.

Stefan