Although the population of people with dwarfism is very low in the real world, mutation can have some affect in the Fallout world and lead to an increase in the number of midgets. Would you like to see midgets in Fallout 4, maybe even play as one? I would assume one have some advantages like being harder to hit with VATS. Would add more variety to NPC's.
Wouldn't need resources to implement, just use a kid for body type with an advlt face.