Phantom, you need to tweak aircraft.cfg (open in Notepad) and air.cfg (open in Air Edit), both files in the specific aircraft folder. Air Edit is a special little program required to edit air.cfg, you may search the net for it. Then the easiest way is to look into these files from a plane that has the spoilers already and see how they are entered in aircraft.cfg as well as air.cfg. Depending on the aircraft you may even want to copy the entries. Good luck.
Cheers,
S