Try to see if this software could maybe bring you the solution:
http://www.flightsimulator.at and look for the FS-Communicator.
I also use it and you can controle all your settings in the program. I am not sure what kind of cockpit/plane you use. The software is writen for the airbus but also the boeing must work ok with it i assum. It also have dual stearing with all the options in it.
Beside the standard settings and NUL zones you can also make your own settings in detail what makes flying much more realistic.
Have a look who knows it will solve the problem?...
You can try the full software for free in demo to see if will suit your solution.
Frans