Right now thief has some very useful pistol traits aaaand… that’s it. Bow and Dagger is a MASTER trait for only 5% damage. Spear and sword have no traits. Short is, there is no traits worth taking (or existing) other than for pistol.
Due to limited trait lists, adding ‘new’ ones doesn’t apply too well, so I would look at existing ones.
Suggestions:
Dagger Training: This should become “Blade Training” and apply to Daggers, Swords, and Spears.
Power Shots: Two things – switch it with “Fleet Shadow” and have it boost Bow range to 1200. The swap is because I think stealth should keep in shadow tree, and force more selection over traiting everything into it. In addition I see ranged weapons as a better fit in the Acrobatics (mobility) tree. Having it add to bow range would make it a serious consideration for taking, giving the thief much needed access to an option for long range.