I've been contemplating on this for while, but...
As crazy as it sounds at this point in development, maybe you could implement some means of skip travelling to areas already accessed in the adventure?
I personally find it aggravating when I get so far into an area, then realize I'd forgotten something and be forced to backtrack a long ways just to get it, then backtrack AGAIN to get back to where I was before.

This is ESPECIALLY rage inducing when I have to go Patchy's library in the SDM to learn new spells from Koakuma or taking care of unfinished business in previous areas.
My point is if there were some means of skip-travelling, it would make backtracking MUCH less of a pain.
This is just an idea, but at least give it some thought. :]
Complaints aside, I'm loving this game so far. Keep up the good work!