19.06.2009, 16:27
You could use a timer to check vehicles position every second and reset it back to its original position if it changes. Other than that no you really can't (short of locking them out of the vehicle).
EDIT: you could also use OnPlayerUpdate for that but I don't know how laggy that would be
EDIT: you could also use OnPlayerUpdate for that but I don't know how laggy that would be