I was able to extract the Joystick and Throttle graphics from the TARGET pdf files by importing the pdf's into Corel Draw x4. Using the convert to text option, this loads all the button names as text, and maintains the throttle and joystick graphics in bmp format.
Here is an example of what I was able to do:
Worked fine for me, but I don't know how you could do it without a pretty strong graphics package like Corel.
As far as whether it is allowed? Uh...I hope so.......Doh!!