I have a Futaba 9 cap and my daughter has the 7 cap..I know that on the 9 cap you can change between PPM and PCM, I do it all the time. I'm pretty sure you can on the 7 cap but can't swear to it.....Are you sure you can't change between the 2 on the 6 channel? it would be in the parameters menu.....
I don't understand why you have to fly the same freq as your dad at all times.....seems to be if you're still buddy boxing that your transmitter as the master to his as the salve will work....the salve remains in the off position.....there is no license required to operate a Radio Control aircraft.....
Did I miss something?