mmagnin as a thank you for sharing this, I put together a zip package with a minor correction ( the dialog folder is called dialogs) , and detailed instructions for installing this, most useful for windows users.
I have just shared it with Global Virtual Airline and expect to hear good reports with-in a couple of days.
https://www.dropbox.com/s/5cyac3gbbrz45uu/FlightGear-ShakingCockpit_1.4.zip?dl=0
I hope other people can find this as fun as I have.
Thanks again. -- Ray
url updated with a version that reminds people to backup preferences.xml