Hi Ron,
I quite understand re the PCM. Up until a few years ago I would have agreed with you entirely, but since the advent of IPD receivers I now use nothing else. These are PPM but with a failsafe capability, availble from Multiplex in 12 channel configuaration and can be ordered to work with the Gruapner/JR transmission protocol. They are also available as synth Rx's and I am now using nothing else in my jets.
So you get the best of both worlds. On the one hand the speed of PPM, onthe other the safeguards of PCM.
Worth a look.
Regards,

John