So, the recent balance patch seems to be pushing hard to make staff the go-to weapon for Daredevil since the shorter range swipe favors the all-in brawler style of fighting over the in-and-out style of D/P and such.
However, Staff is far from strong enough to perform in that role and I don't think anyone wants to see this weapon buffed in a way that returns it to the vault spamming days.
Because of this, I suggest putting some blocks staff skills. This would make a staff thief a more viable bruiser-style fighter while also fitting the theme of a melee staff.
How to do this? It'd probably be best done by redesigning at least one skill instead of putting it on something that's already frequently used like Weakening Strike or something rarely used like Debilitating/Dust Strike.
If it were me, I'd replace Debilitating Strike with a new attack that moves forward striking, while blocking attacks. Vault already works as a good withdraw with longer range, so Debilitating Arc is relatively redundant. For damage, I'd put the new attack at something lower than Weakening Strike, but add a modifier that increases damage done if the target is weakened or blinded. Initiative cost should be at least 4 if not 5. This would mean that players would be incentivized to use the skill after first casting Weakening or Dust Strike, but wouldn't be incentivized to just spam the skill.