Yes, to go along with farmer, there can be a "Miller" someone who mills wheat to create flower. lets say if you have a miller, for every miller you have, the productivity of 4 farmers doubles.
As for lumberjack, there could be a.....what do you call it, the people who take logs of wood and turns them into boards and planks, i don't remember the name, but the deal as the miller, for every one of these guys 4 lumberjacks income is doubled
Also Supervisor, every X amount of supervisors add Prosperity as long as there are 10 me more workers below each one.
A Stock Manager, who adds prosperity, this guy constantly keeps tab of the stock, like what they have and don't have.