There are lots of turbo prop singles out there that have strakes on the ass end to help with the yaw caused by the spinning motion of the engine.
Yes, this is a ducted fan and the component would be small on a commercial jet it is still in the equation. Why do you think wind up turns are so hard on rub strips and the fan? The engine wants to go one way and you are making it go another.
I suppose I could be totally off my rocker.