I think alot of folks forget this game was orginally designed for Lv50, at those levels RDM's enhancing skill had a much greater effect. Despite this however, enhancing skill still directally effects most of our buffing repetuare such as our En-spells, Stoneskin, and obviously Phalanx.
To be perfectly honest, I don't think the anwser lies within a new barrage of spells. For one our magic list is already cumbersome, then we have to farm or buy these new spells, probably for extorted prices (Example: Tier IV nukes). The most serious issue I can see really lies in the soft/hard caps which were likely designed for Lv75 jobs. If SE were to adjust the soft/hard caps to accomidate the higher levels I think it would solve some of the issues.
On another note, the idea of a JA that would increase enhancing spells by either effect or otherwise would not be a bad idea. One in particular idea I've had in mind, is while active this JA adds power and additional effects to En-spells corresponding to the En-spells particular element (I.E. Enblizzard I/II = Paralyze or an Elemental DoT like Frost). Like the elemental resistance down from the Tier II En-spells the additional effects grow in power to a certain degree.
The idea of this JA is to allow RDM a better oppertunity to move into the front line's by improving their power a bit, and reduce the amount of spells they need to cast while still offering a little mage support at the same time.

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