Have inexperienced colonists gain extra exp when doing a job next to experienced colonists.
Example : Colonist A with 5 construction is building nearby another colonist B with 18 construction who is also building.
Colonist A gets extra exp in construction during that time.
A will not get extra exp if they had 9 construction.
Not exactly what you're looking for but I guess it more or less does the same thing, Craftmanship lets pawns with shared passion teach other when they are socializing, so that the less adept pawn gains XP. Also gives a relationship buff, which is nice.