I play with my girlfriend, and we usually level together as to not get ahead and see new things without the other.

A rested EXP toggle that you could turn off when you didn't want to use your rested would be nice. We constantly have to make sure both of us want to play before doing anything, because we will use up the rested on something else. In other games, you only have one class (usually), so all the rested is used on that job.

In XIV, you have a choice. But everything you do uses the rested up. For example, I might be tired one day and just want to craft or gather, but I would rather use the rested on my main battle/magic class. I would have to first use up my rested on my battle/magic class then do whatever it was that I wanted to do.

Just a thought.