Yoshida commented on distributing exp to jobs that you aren't even playing. He doesn't like the idea, saying it defeats the point of job exp.

Just do fates while you wait on dungeon queues. You can even solo fate bosses as a dps if you bring a chocobo and potions. I got all jobs to lv70 no problem this way. There are also exp bonus fates, and forlorn maidens for an additional bonus that stacks with the other bonus.