Interesting point Dar. I hadn't thought of that. Not having any experience with full size leaves me at a bit of a disadvantage.
I chose that configuration based on the torque created by the pair of engines. If the standard rotation engine has a tendancy to want to "pull" to the left, it stands to reason that a CR engine would want to "pull" to the right. Having them "pull" towards each other would seem to be beneficial. In my mind I was adding thrust/torque vectors.
Being able to control a single rudder aircraft might have a slightly higher priority though!
Starboard it is.

The OV-10 Bronco is different animal.