[IfritnoItazura]

Lose the Rogetsurin, cap your throwing skill (outside of exp party), then switch to shuriken. Follow that with Juji Shuriken when you get to that level. Macro in Beetle Rings +1's for throwing like Sabaron says, then switch back to melee rings. (I wouldn't use /wait; I'd just have one /ra macro with r.acc, and another macro for melee gears.)

Breath Mantle is nice, but I would definitely recommend Dorado Sushi--gives you enmity, and makes both your shuriken throwing and katana swings more effective. Accuracy+ and Enmity+ make great buddies.

At Lv.25+, I loved my Federation Tekko and Republic Subligar. (Hurray for Mithra!) Don't worry, no one will really go blind even if you're not a Mithra. Probably.

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Not sure what you're doing exactly, but Utsusemi casting itself generates fair amount of enmity--I've seen mobs turn/run back to me after I finish casting Utsusemi many, many times on both NIN/WAR and WAR/NIN.

That said, Utsusemi's enmity is no match for Kurayami's. Tell your mages to not cast Blind before you get off a Kurayami attempt at the start of each battle.

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Ichi level Elemental Ninjutsu... er... Waste of time, mostly. You'll get better result using that time to Provoke, swing katana, throw shuriken, attempt Kurayami, recast Utusemi, etc., etc.

The exceptions?

A) Magic Burst. I've actually seen useful damage this way from Tarutaru NIN's. I suspect having Ninjutsu at or near cap would be needed.

B) Lowering resistance to certain element--for mages having trouble with certain debuffs or want to increase accuracy of attack spells. I've only seen this done right by a BLM/NIN. (Yes, BLM/NIN. Honest. And, yes, another Tarutaru.)

Real NIN's should be able to do that just as well if not better, after working out with the mages on the which spell and when.

Otherwise, don't bother with Ichi level elemental attack/debuff Ninjutsu.