Vehicles around Airport

Anyone Since I have the 'World Airport' installed into my program, it has a vechiles that would drive around or is parked by the airport. Based on the frequencies. Speaking if I request for taxiing clearance the frequencies would trigger to have vechiles to drive off from the parked plane. But the only problems is that they don't have it at every airport. So since then, would it be possible if I just create one myself for an airport that doesn't have one? would AFCAD program or any such kind of program be able to do that? would it affect the framerates?? let me know??