Ok, with the Saitek X52 Pro, [Mod - Happy Thoughts]igning a keyboard key to the PTT in vPilot and then using FSUIPC to [Mod - Happy Thoughts]ign the desired X52 button to this keyboard key does the trick...
But it would be nice to figure out why it doesn't work "natively".
Otherwise, very cool piece of software !
It's bye bye FSInn for me
One suggestion: could you make, like FSInn had that possibility, a "minified" version to keep on top of the FSX screen instead of the full interface, which takes up quite some real estate.