Hi Pete, 
I'll try to clarify what I mean: 
I know about the two options in FSUIPC, one for PTT and one for PVT. That is also almost exactly what I need. But I want to use one joystick button for both functions. I don't want to trigger both at the same time, but I'd like to use a fsuipc offset for that.  
Another example: 
I'll take one free offset, size 1 byte. For example (the offset-adress ist just an example) offset $1234. If the value of that byte is 0, I want to use the joystick button to trigger PTT. If the value is 1 I want to use the same joystick button for PVT. 
So to summarize that: 
I want to use one button for two different functions, depending on the value of a specific FSUIPC-Offset 
Thanks for all your help! 
Daniel