Anyone? 
i think sean does it in his flip vid…i believe its called an “outback fllip”
alex toms does one in this video (the last trick). He does a sib inward unispin (an inward unispin is a 180 unispin while doing a body variel in the other direction)
Video
an outbackflip is a seat in to seat out 180 unispin with a back crankflip.
A couple people have done it…one time there was a video of someone doing it rolling, and one handed. It was sweet.
he was a buffalo soldier