Asides from some of the stuff already mentioned, I think that the two most underused and fairly lacking abilities need to be addressed, Cover and Tempered Will.

The basic concept of them is okay, but as is their use is far too situational and rarely is useful.

I've personally been trying to utilize Cover more and I do like it but I find its CD way too long. If the CD for it was like dropped to 90 or maybe even 60 seconds and had a slightly longer range I feel people would use it more especially as an OT providing extra protection for their more easily killed party members.

As for Tempered Will, again what it does is sort of nice but it could maybe do a little more like maybe also affect paralysis and again its CD is way too long and should be dropped to at least 120 seconds if not less. Right now I only really use TW to remove heavy when I get hit with it while riding my chocobo.