I wonder if any of the 'Brain Gym' genre of games train this delay gratification? lumosity.com has games targeting attention but they aren't the games mentioned in the article.
edit: I don't know much about Brain Gym, but Pamela Paul has a whole chapter in Parenting Inc. comparing the different ECE programs, which might answer your question.
This game claims to train this ability ( but I cannot vouch for its effectiveness) http://games.lumosity.com/brain_shift.html