complex aircraft have to use LVARs ... That is why the Simulator has them .... for Add ons to be able to create and manage their own data areas.  This is the same reason why the "defaults" don't work with the Working Title CJ4 or the FBW A320....  They also require special control ... in their case they did not even do LVARs which is declarable and they did H:Events which you have to go through their data to find out what the commands are....  Digressing...   You can't use the Default