I am building a twin f-4 with two bvm 91 engines, the problem is if i use the in flight mixture control i will need 9 channels and i only have an 8 channel transmitter, in the past planes i have had i had i9n flight control but never really used it when in the air, only on the ground before takeoff, whats everyones opinion on this, would it be ok to go without the in flight mixture control and just adjust them on the ground. thanks