You can't do this only with an easy button! That would mean, that the arrowspray use 5 arrows in hard mode and 100 arrow in soft mode! How should the larians make this?
Actually, why wouldn't this be possible? I think this could be easily done using just different multipliers: as an example: 5 damage per shot for hardcore, 10 damage per shot for difficult, 15 damage for medium, 20 for easy and 25 for casual.
