Hmm, good to know. Theory is that a check valve in the crank breather can reduce positive pressure in the bottom end and thereby among other benefits reduce how much air/oil gets spat out. Ducati, BMW, even Harley uses them, and have been for quite a while. The new Panigale goes so far as to having a pump in the crankcase to keep it under negative pressure. Methinks it can help. They aren't expensive, either.
Reed valve breathers are the simplest way to reduce the crankcase pressure.