I have flown my P2 setup for some time using the stock controller and am thinking about the idea of customizing the P2 with additional widgets that I can play with from the controller. The two that came to my mind is something to turn off and on some LED and perhaps a small catch to release a parachute toy. Now, the stock transmitter only have 7 channels that are all used up, but if I use move towards a separate 9 or 12 channel controller how would one hook up the additional channels to switch or servos? Can I connect the receiver D-BUS to the additional switches directly? Or does it goes into the P2 FC and then I get some output from there? Is there a hub that I need which will split the 7 channels into the P2 FC and 2 for other purpose? Sorry if this sounds elementary, but I never had any experience with D-BUS before.