Easy answer - and again we went to this setup years back -see our EMC2 design - 1997 and it was used very successfully -by both East and West coast flyers.
basically the model just has more vertical fuselage area around the CG .
you keep whacking down the rudder/fin -till yaw damping is poor and add a bit back -
Also you can reduce roll couple when doing this .
When we first did it it was not the "kool" setup - but -- there ya go --
The new (?) wide look is much the same - the models are quite low in wing loading and very neutral .
My latest foamie stuf even for 3D is much the same - my Cassut is a prime example .
Goerge Hicks' Tensor, is a study in this setup -and it is extremely effective - to the point of being a bit different in required control inputs.
The need for rudder inputs is very low for any maneuver.