I'm sure they are out there but as far as I'm aware there aren't any twins approved for spinning! I did meet an instructor once who had a student do a Vmc demo gone wrong and put them into a spin - took over 6000' of recovery, they were lucky!
Englishal
Sorry i was not clear it was full blooded stalls in twins not spins while now the tendancy is towards incipient and avoidance in everything. But without naming names i too know of some old dogs who spin twins accidently of course
and as for barrel rolls?
Soon we will have incipient takeoffs and landings at this rate