Suggestion: Sneak and Invisible
My biggest problem with XIV, is the placement of aggro enemies.
If you've ever tried to solo some Nanawa Mines battleleves at low level, you would know how frustrating it is to constantly run back and forth through corridors filled with Chiglets and Diremites. More often than not, you will die by trying to pass them.
While you can with some hardship succeed in dispatching the leve monsters, the surrounding monsters will slow you down, kill you and waste precious time from your 30 minute limit, ultimately causing you to fail. Not failing because you couldn't kill the monsters, but failing because you couldn't get to them.
This frustration could be averted with the implementation of Sneak and Invisible items or spells.
Of course, some monster types or NMs could have True-aggro traits and spot you through sneak or invisible, so with a good balance it wouldn't make the game easier, just more enjoyable.
*For anyone that don't know what I mean, Sneak and Invisible are two enhancements from FFXI.
Sneak lets you bypass monsters that aggro by sound, Invisible does the same for aggro by sight.