Although I tend not to use the PDCS for the same reason as CoolP, I have found that if I slowly and deliberately press the buttons, it can be used without an FSX CTD. The problem is that if you forget and press about three buttons in quick succession, the CTD is likely to occur.

It would be nice if... (1) The problem was fixed. And (2) the PDCS actually moved the EPR bugs to the correct setting for the flight mode.