rod03801: "Will the cube be usuable in the backgammon games in those? Will there be an additional step in the creation asking if you want the cube for the backgammon portions?"

Interesting questions. The Backgammon-with-cube has the same Game Id as plain Backgammon so no existing tournaments will be effected. With new ones I imagine that you'd either have the cube with your gammons or not but not both. (Maybe there'll be a single Use doubling switch covering all games or maybe there'll be both versions of every backgammon name.)