Not as far as I know. I also like to mess around with some of the boats, trucks and cars available for FS9 and I have to change the realism settings every time. Of course it depends on what you want to change. Some flight characteristics are defined in the .cfg file for the airplane. You can adjust those if you want but be aware that adjusting one thing can lead to changes in another area of the flight envelope. Make small changes and test each one thoroughly before proceeding. Also back up your original file.
PS.
BACK UP YOUR ORIGINAL FILE!!! Just in case I need to repeat it.
