I think it would be a nice addition to somehow have access to a list that shows all of your workers. From this list, you can see each worker's specialization as well as current status (developing game, training, idle). You could also fire workers from this screen. This would certainly be a welcome addition for many.
To those who can't figure out how to unlock the green section of upgrade branch, you have to upgrade your original hero to level 3, then the green branch is unlocked. Vote this up for players to see.
 "Idle Blacksmith"){kind=icon}
 "Game Corp"){kind=icon}
 "Simple"){kind=icon}
 "Epic War 4"){kind=icon}