The brawling warrior feat lets you add +1 to hit retroactively after attacking if you have a weapon in one hand and nothing in the other. A staff is a one-handed implement and a two-handed weapon.
So can I add +1 to my implement attacks with the staff? I read on an old post here that the answer is no, because the staff has to be used two-handed to count as a weapon. Couldn't you use it one handed as an improvised weapon though, and can't you make the same argument for any implement to be used with the Brawling Warrior feat?