1) The style requires a melee weapon. If I use the melee weapon to make a ranged attack, I forfeit the opportunity to make a free Dirty Trick, right? Because Dirty Trick is usually only allowed in melee.
2) The second ability of the feat - Additionally, if an adjacent target attempts to remove a condition that you inflicted upon it with the dirty trick combat maneuver - is independent of the first ability of the feat, right?