It is best to maintain the seperation. Every situation will be different and in some cases you will not run into problems, but in many cases you will. RF can be a pain in the a##.
You can use either PPM or PCM, but set your model up "glitch free" with PPM before using PCM, so if you do have a problem, you won't mask it with PCM.
As for the Fugi, well all I can say is "search function".