Radio DX7 vs DX8 or suggestions

[Hotwheels]

A lot to figure out but I enjoy a challenge and in no hurry. I know what I want the functions to do just have to figure out the how to part. Is the 3 position rudder able to operate servo for transmission? If so can you shift on the fly by toggling between the three positions on rudder with what I have so far? I know some wiring will change when I add MFCU. If anyone knows of a setup link for the DX8 and Tamiya Riggs would be most appreciated. I saw some good info on DX6i and Tamiya MFCU posted on this site. As I have stated before was very active in competitive R/C buggy racing, pan car racing and built a couple Team Associated 10th scale nitro cars. They were much simpler with two channel radios. I am sure this DX8 has the capabilities to perform all the functions. I just have to bring myself up to speed.