I have two questions which I have yet to have found the answer to. 1) Is it possible to have an RC channel in and map to two RC channels out without using a Y cable. Also, what properties exist for the elevron configuration for supporting inboard flaps and rudders?
Yes. Use the RCxx_FUNCTION parameters for that sort of stuff.
You can of course invert them as needed with the RCxx_REV parameters.
The section in the faq about crow/flaps should also help. Elevons are well covered in the manual already.