I guess the first thing to sort out would be.... to forget what we have learnt in the past, when in come to channels for example the duel axis sticks would be known as channels 1 to 4..
we need to find a new word for these channels.. how about "impulse generator" these control any impulse required by a Servo/ESC/switching unit or the such likes...
in a computer controlled Transmitter these "impulse generators" can be selected and in the options menu allocated to any of the knobs/switches/sliders or sticks that your Transmitter has.
so for example: forward and revers of the main drive system, could be on a switch or slider or anywhere on your transmitter, it does not have to be on one of the duel axis sticks...
once we have understood this, then there is hundreds of options open..
Some of the Knobs/switches/sliders that your Transmitter has, are already allocated to computer programs (mixers)..
for example Dual rate / Expo / flight phases.. I don't suppose these are terms that every one understand..
Dual rate (DR) = the length of travel a Servo will take, with the Dual rate this can be shortened
Expo (exp) = the speed or sensitivity of the Servo..
flight phases = can switch the motors of, or set them an a permanent speed.. good for Voith Schneider propultion systems