Axe controller's not a bad idea actually; I need one anyway for my next feather.. I'll probably just change the firmware on the Servo controller boards for that though as they're fairly similar in hardware requirements. It would likely be a time based system where the axe fires at full power for an adjustable amount of time based on the potentiometer on the board. I'll see about having it switchable to manual control on the rudder channel too as that's something I'd quite want for self fighting... May also be able to do limit switches, but I'm not sure I'll have enough IO pins for that!