One of the reasons I purchased the 9C is that it allows you to customise to your heart's content. The only downside is that 9C implies nine fully-proportional channels, whereas, in reality, the ninth channel is just a basic on/off channel - not proportional.
Every single switch is easily assigned for any particular function, but what the manual doesn't tell you is that the internal software can be manipulated via 2 x secret service menus. All you need is to hook a 1,000-ohm resistor between pins #2 and #7 behind the CAMPac hatch.
Once you're there it's dead easy to reassign any of those switches. For instance, switch 'A' is a 2-position on/off switch. You can easily change this to a 2-position momentary switch, or a 3-position switch, or even change it to a standard 5k pot' for proportional use. You just have to set the parameters and the software takes care of the hard work.
In other words, say you have a servo hooked to channel 5, and it's controlled by a basic 2-position switch, rotating from fully clockwise to fully counter-clockwise. Fine, but what if you want the servo to also come to rest at center position? Simply swapping the 2-pos switch for a 3-pos switch won't work. This is where Futaba have come to the rescue by including all the relevant, clever programming, all easily accessible from the service menus.
Probably useless junk information for most modellers', but interesting to see that there is also the possibility to play around with a zillion other parameters, such as stick re-alignment, total number of hours the radio has been used since purchased, etc, etc..........