What would SE have to put on a shield for you to consider using it?

[Lastranger]

Well if any stat i can think of can be aplied to it id probably be something rdm only for single wield purpose

Like :

Manaeater : Active Trait that drain 1% mp too boost Enspell's dmg on evry hit, scaled at increments of 5mp for each tier, each tier would add another doubling off original enspell dmg, so if u got 1000mp total mana pool u get 3x enspell effect on evry swing, a 1500 pool would = 15 mp evry hit meaning u do 4x the original dmg on enspell dmg.
Also it works on spike's spells so evry time they are triggered u loose mana for more dmg scaled just as enspells.
Evry added Trait would add a 0,5% drain, from other gear.

Augement Enspell's : Make all enspells activate under active trait Manaeater on evry hit in exchange for the drained mana, add 2x mana cost on enspell cast in exchange for enspell +10 boost.

Augement Fast cast : Turn active amount Fast cast into 50% magic Haste / 50% Job Ability Haste with a small scale loss off 20% effect in exchange , So if u had 50% Fast cast u would get 20% magic haste / 20% job ability haste.

Augement Defensive spell's : Active under effect of trait Manaeater, Boost Stioneskin/blink/Phalanx/2/Barspell's/Spike's with 50% increase in lenght and effect against 2x mana cost

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Another Set might have same Trait but other aug's

Manaeater+ (allready described)

Augement Healing : Under effect of manaeater evry healing spell gets boosted by adding double cost to spell.
Double effect for double cost , includes regen Spell's

Occ. Instant cast : Under active trait manaeater will sometimes instantly cast spell's, effect is activated at a base % of 5%, but enanched by amount Fast cast u have in a 1/2 Scaling so if u have 30% fast cast u gain standard 5%+15% from fast cast.
Add's 50% mana cost to instant cast spell, will not work if u have too litle mana to use spell, and will cast normal instead.

Channel Manaeater = healing : Under trait Manaeater channels 1% mp on evry cast too boost healing potency,

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And a final set could have :

Manaeater : ( explained )

Augement Element magic : Under effect of manaeater evry Elemental spell gets boosted by adding double cost to spell.
Double effect for double cost.

imunity break : Under effect of Manaeater trait, all Detrimental spells like Slow/2/para/silence/bind etc will cost 2x original cost in exchange for posibility to break Imunity of monsters when casting a slow etc, once imunity is broken the spell may or may not take effect depending on monsters elemental resists vs Enfeebling magic skill u posses.
Chance of breaking imunity is at a starter level of 5% + 1% chance for evry 50 Enfeebling skill u posses, and used with Sabotour Doubles ur total % when on.

Channel Manaeater = Elemental : Under trait Manaeater channels 1% mp on evry cast too boost Elemental potency


Of course this is all in the realm of if only they could add this, but i think it would add to the gear makes ur jack of all trades stand out in one job.