Greetings,
It would be good to recall that a radio control receiver is actually a receiver/decoder. The format of the radio signal is:
- Channel 1 pulse width - Channel 2 pulse width - Channel 3 pulse width - - - Channel n pulse width - Extra long pulse for Reset to Channel 1.
By hacking the receiver/decoder and finding the input to the decoder chip you could get all the channels on one Arduino input. Then you could output the channels to individual Arduino outputs or combine them in a pulse stream back to the decoder chip, or write the positions to another external board.
You may need to check out the timer tutorials on avrfreaks.net. Then you would need to either hack the Arduino libraries (which I have not done) or program using WinAVR (similar to Arduino but not as easy) then you can get full access to the timers