I'm curious about the point of this? If you just want to spam lower level dungeons or FATE, there's nothing stopping you from doing that now. If you're wanting to do your job quests over, you're already able to. I don't think it's likely that anyone leveling a job will use the market board, when all leveling dungeons now have level relevant armor. And if the goal is to simply level up a job, tomes sets wouldn't be of use very long, as quickly as we level up. So what exactly is it that you're proposing from this that would be worth the development time over our currently existing options? Being able to turn it off willy nilly seems no different than just intentionally doing lower level content.