In my mapping context I have an action for “Look” and I added a scalar modifier to control the aim sensitivity. But I can’t find a way to set that specific modifier in blueprint.
Use Add Player Mapped Key. It’ll replace the key for the mapping name with whatever you want, you don’t need to unmap anything. From what I can tell, there’s no way to save this unfortunately, so you’ll need to set up your own system with savegames.