VTOL Tailsitter Duo custom mixer

I built a Tailsitter Duo but added a V-Tail to the airframe. I have been experimenting with building the code with a modified mixer to allow for pitch and yaw to be controlled by the V-Tail. The problem I have is no yaw control from the V-Tail mixer. The elevator portion works perfect. I am wondering if somewhere in the code the Generic Duo Tailsitter configuration only allows for elevons and does not allow me to specify a Yaw controller in the mixer.