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From the plan form view it is easy to see why Burt named it the Boomerang.  Notice that engines are much closer together laterally than on conventional light twins.  The Boomerang's engines are 88" apart laterally while, for example, a Beech Queen Air's engines are 150" apart.  This by itself will give the Boomerang better engine out controllability.

Yes, but what about the two different thrust axis to CG moment arm lengths?  The CG is marked with a "+" in the drawing.  At cruise there is indeed asymmetrical thrust trying to yaw the plane to the right.  This asymmetrical thrust, however, has a negligible effect on the plane's cruise performance.  Indeed, a mere 1 1/2 mm of rudder deflection would take care of the yaw due to the asymmetrical thrust at cruise.  No rudder deflection is required, however, because a countering cant is built into the vertical fins.  So what happens at slower speeds?  Let's check that out on the next page.