I think i've posted this a thousand times, I'll post it a thousand more. THF is a great job, But it falls short in anything but Treasure Hunter'ing. (which is nice... Its what THF's do)

That being said, I think a Job Trait, Level ~80+, That allows us to SA from sides/front for a penalty to the SA bonus would be nice? and not too broken... Like say...

"Illusive" (IDC about names bite me ;
Allows use of Sneak Attack from sides or front of mob with Penalty to Damage boost.
(Back(normal): 100% DEX >)
(Sides: 75% of DEX)
(Front: 50% of DEX)

However, with this, Introduce a JA like "Restraint" for SA/TA, Like follows>
"Concentration"
*blahblahRPcrap*-Through combat you learn your enemies weakness, Each successive hit increases the damage for Sneak Attack and Trick Attack.
*Each Hit would increase SA and TA's Mod (DEX or AGI) by 0.5%. Cap of +50% mod (I.E 150% of your DEX to Weapon damage) > It would take 100 Swings to "Fully charge" it. Wears off after 1 use. Effect lasts 5 minutes. Recast timer 10 minutes. Effect stays on full duration, but the "Charge" wears off after SA or TA is used (resets it to 0)

Also, For job Traits in general-
"Critical hit Rate Bonus" Lv. I~V at 10/30/50/70/90.
3/3/3/3/3 for a total of +15% Critical hit Rate.

"Critical attack Bonus" Lv I~VI at 15/30/45/60/75/90
5/3/3/3/3/3 for +20% Critical hit damage.

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These improvements would help THF a lot in the DD department, and make up for their weaker weapon damage. (lets face it, inside abyssea, we're not that far behind, outside we flop on most mobs)