Donīt ask me why?? cuz I donīt know the answer.
Back when I bought my second plane, a Golberg Tiger 2. It came with dual ailerons, something I wasnīt expecting. My LHS told me about connecting ailerons to channel 1 and 7. And trust me I was a little bit in denial to try it. But I did. Works just fine. The thing is that both ailerons will work the same way, so you have to make sure of the orientation which you srew it in the wing panels. But its perfectly normal. The equipment I was using was a FUTABA FM dual conversion 7 channel receiver, don't remember the model, but it came in the box with my FUTABA 4vf FM radio.

Try it, it'l surprise you just as it did me.