I'm designing a Canard configuration uav, to use with APM. I know that only elevons and traditional control is implemented so far but, i'm am hoping the community can help me modify the code to add the necessary channels. 

I'm am hoping, eventually we will be able to set our own mixing in the ardupliot configuration menus, as i am aware there is room for this in the APM road map.

For example, if i can add an auxiliary channel to only act with the pitch commands I can hook it up to the canard, while keeping elevon mixing features on. 

another idea is to create a blended flying wing with a vertical tail hanging in the back, sort of like a manta ray (using elevons, and rudder only). It's just an idea but building the platform is releativly easy compared to getting the control systems to work. 

Is anyone else trying to set up similar platforms?. These would most likely be scratch built platforms, but the freedom of using a custom designed platform is very appealing to me(designated cargo space, calculated payload, a unique design), rather than buying off-the-shelf platforms. Also, some times cheaper if you know what you are doing.

My plane is only flying with elevons, with a fixed canard, and im hoping i can get that canard working to have more pitch control. if I add some sort of drag rudders, would I be able to use the rudder channel to controll the direction of the aircraft under auto mode?

any comments or experience with custom frames or APM will be welcome