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Hi RobSTAR!
If it is a function that can be operated with the keyboard in the game, it can also be set to the button box.
The Sim Dashboard help page will help you.
Oh I see, sorry I didn't understand the question.
I am using keyboard emulation so far for doors etc, I will add telemetry to my design for speedometer, rpm and lights later, this is still a WIP, we can have shortcuts for most functions, it would be nice to have Kitchen/Hostess clearance and to lock/unlock baggage bays please, then I can share my design with the community 
Maybe you should try the telemetry interface because there are a lot of commands that aren't available for the keyboard.
Here is a list with some of them:
GearUp
GearDown
DoorFrontOpenClose
DoorFrontOpen
DoorFrontClose
DoorRearOpenClose
DoorRearOpen
DoorRearClose
LuggageFrontRightOpenClose
LuggageFrontLeftOpenClose
LuggageRearLeftOpenClose
RetarderUp
RetarderDown
RetarderMaxOff
FixingBrake
ToggleAircondition
AirconditionPlus
AirconditionMinus
BeginAnnouncement
LightSwitchUp
LightSwitchDown
ToggleASRThreshold
ASRThresholdOn
ASRThresholdOff
ToggleWCClearance
WCClearanceOn
WCClearanceOff
ToggleDriversLight
DriversLightOn
DriversLightOff
DriverWindowOpen
DriverWindowClose
ToggleReadingLightClearance
ReadingLightClearanceOn
ReadingLightClearanceOff
TogglePassengersLight
PassengersLightOn
PassengersLightOff
ToggleDriverMonitor
DriverMonitorOn
DriverMonitorOff
LiftUp
LiftDown
FrontLiftUp
FrontLiftDown
RearLiftUp
RearLiftDown
MotorStartStop
CruiseControl
Horn
MotorStart
MotorStop
ToggleWLANClearance
WLANClearanceOn
WLANClearanceOff
KitchenClearanceOn
KitchenClearanceOff
FanfareStatusOn
FanfareStatusOff
PassengerMonitorOn
PassengerMonitorOff
LockLeftLuggages
UnlockLeftLuggages
LockRightLuggages
UnlockRightLuggages
LockDoors
UnlockDoors
AirConditionOn
AirConditionOff
ParticleCleaningAutomaticOn
ParticleCleaningAutomaticOff
ParticleCleaningManuallyOn
ParticleCleaningManuallyOff
AxisDischargeOn
AxisDischargeOff
BrakeMaticOn
BrakeMaticOff
MirrorHeatingOn
MirrorHeatingOff
WindscreenHeatingOn
WindscreenHeatingOff
WindowShadeDown
WindowShadeUp
TogglePassengersMonitor
ToggleDestinationDisplay
DestinationDisplayOn
DestinationDisplayOff
Cockpit1
Cockpit2
Cockpit3
Cockpit4
AnnouncementOn
AnnouncementOffABSOLUTE SUPERSTAR! 
Thank you!
