Gathering

[Niwashi]

Supposedly the Rogue "Mug" skill can increase drop rates if it's the killing blow, but it's not by enough to be measurable or useful. What we'd need is something like a stance (independent of other stances, but a stance-like toggle skill) that lowers DPS but gives a significant bonus to drop rates for HQ or rare items.

If it's going to have a significant enough affect on drops to be useful, though, it's going to need a detrimental effect to counterbalance that. (I'm guessing that's why Mug's affect on drops is too minimal to be useful. It lacks any such counterbalancing debuff.) A DPS debuff, or possibly defense debuff, could make it viable.