Harry i dont think forcing player to "train" slaves without combat and ingame training function is right idea
Upgrade points from harvested slaves is a bit too strong, but i kind of need this points to upgrade anything, complete rebalance of Upgrade points could be good solution (made some upgrades dont eat AP at all and give AP only for selling obedient slaves/doing quests) i dont need changes here
You need FARM MENAGER (special job for slave) to made farm works