I think it would add something to the mod if hired lumbers and miners were available in the mod. Faction like Isengard and dwarf faction don't have any farmhands but are known if both the films and books for cutting wood (isengard) and mining (dwarves). Especially digging out great dwarven halls in the mod takes a lot of time and effort with the lack of a beacon and efficiency 5. Besides that t can be very costly if you spend all your time mining. To help people that want to make huge dwarven city. Dwarven miners would be a great benefit. Ofcourse there should be an evil variant for this. Goblins (gundabad) are also known for living underground so it wouldnt be weird to give them some miners as well. I think that this would also make the gundabad as an faction a bit more appealing.