Lots of good ideas here, but I'd like to reply to something I noticed.
Perhaps adding these as job traits would be good, or perhaps not (would 4% extra Haste be broken?), but the Red Mage AF3+2 set, and the AF3 cape already augment duration, and while they aren't as amazing as the 3x duration bonus Composure does on self, it does all add up to a 1.65x duration on people you cast on.
Again, maybe this would be a good change, particularly with Mind caps being increased, but between Saboteur and AF3+2 set effects, you get a straight 10% buff to enfeebling effects in general, and an additional 20% to duration and effect if you use Saboteur.
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All that said, Blink II, Stoneskin II and Haste II would all be welcome additions, but SE should give them to both Red Mage and White Mage, and to emphasize that Red Mage is the better Enhancer, make these spells rely heavily on Enhancing Magic skill, including Haste. (I admit, I have a bit of an agenda here, part of it being to punish people who burn a White Mage mule and bring it to events then complain when it gets all their drops.) Having undercapped skill would ideally make Haste II about as effective as Haste. Even more ideally, the recast on the spell won't be 20 years, especially if you don't have Fast Cast or you have Composure up.
While we're at it, perhaps Red Mage should get a boost to Enhancing Magic Skill ranking from B+ to A- or higher. Having Scholars be able to Light Arts their way to equal skill is never something enjoyable. Alternatively, give Red Mage a job trait that boosts Enhancing Magic by a set number.