In my opinion, PCM would be a lot of work for no benefit. There are many more productive and fun things to do with your time.
BTW, if you want to use the library with a receiver with an inverted output, in ServorDecode.cpp change:
volatile byte pulseEnd = PULSE_START_ON_RISING_EDGE ; // default value
to
volatile byte pulseEnd = PULSE_START_ON_FALLING_EDGE; // inverted pulses
then recompile the library (by deleting ServoDecode.o and rebuilding your sketch)