We probably won't see official rules coming down the pipe with this game mode. In truth, there's no too many conflicts in this version of the game, although it could use a good balance tweak.
Whenever complications like this arise, I always like to refer to unofficial groups and how they call it. It's helpful in that it shows how other people are playing it, and it gives you an idea of how you can use it.
As always, talk with your opponent before the game. Maybe even make a list with and without just in case. I think most people will accept it honestly.