New vehicles ingame

I have a quick question for everyone, I would like to add a vehicle in the game but I would not like it to appear on the list, is this possible or not?

 

 

       I found how do that , juste change in cfg files the line

 

 UseSmallTeleporter    TRUE
                

by

 

 UseSmallTeleporter    FALSE

 

And new vehicle not appear in the list