Thought it'd be a cool thing if Gunslinger had an ability where you choose an area, 'slinger holds his hands over his pistols for a second, aims, and then "fans the hammer" from the hip with both blasters, dealing damage to all enemies in the area. Like Mccree's ultimate, but with two blasters.

Fan the Hammer is not possible with dual blasters. When a gunslinger fans the hammer he has one hand on the trigger and one on the hammer. He quickly pulls back the hammer holding the trigger down which causes the bullets to fire rapidly from the hip. I guess with four arms he could do it.