Err... given those are different games, both setting and system-wise, I'm not sure I understand the question.
EDIT: I mean, the secret spell lists me and Crawd have been speaking of could be something as "Only Sith have access to Force-Lightning; only Jedi have access to Force-Heal". Is that what you meant?
It's just that I don't think FFG will use 4e for their game. In fact, If they decide on using customized dice, like the other two listed rpgs, then how would the idea of rolling spells together fit into existing FFG systems? I'd imagine that it would simply add extra dice, lower difficulties, or changing the result based on particular facings (i.e. kami gets angry or changes demeanor). Or would it fit more into how they've done classes?