would be sort of neat if you could either recruit or train specialists through schools, depending on whether your fief is a castle, city, or village, such as, in no particular order:
bowyer, fletcher, leathersmith, tailor, blacksmith, carpenter, wood-carver, armourer, swordsmith, metalurgist, gem-cutter, quarryman, stonemason, logger, prospector, alchemist, baker, butcher, brewer, banker, game-warden, scribe, and commodity broker.