The EotE core indicates players are not obligated to roll a dice pool, that once they are "aware" of their chances of success they can choose to not roll the dice.
Let's say, as GM, I flip a dark Destiny token to upgrade a check, and the player then decides to not roll the dice pool...does that token get flipped back to dark? Not that my players have done this (or even thought of doing it), but it seems a workaround to getting more light Destiny tokens stacked in the players' favor, particularly because the intent to do so would be practically impossible to prove, especially in the case of canny players.
What are your thoughts? Flip the token back, or no?