Using the damage falloff variable in DamageType?

When I make a Blueprint extending the base DamageType, one of the variables is “Damage falloff” but I can’t seem to figure out how to use it. I’ve got a projectile that uses a custom damage type with Apply Radial Damage with Falloff, but it will only use the falloff pin on the damage node and ignores what I’ve set in my damage type. Is the damage falloff variable in damage types just not used for anything or am I missing something?