It's relatively early in the beta to tell, but I think that having a unit editor like in the Legendary Heroes might be useful. Trained units as they stand are not all that powerful, especially as you move towards end game. Certainly there are some that are potent like Paladin or Battlemage, but they seem a bit too specialized.
A unit editor would give more flexibility, allow for costly units that can justify the costs, say of extra logistics, and keep them competitive for end game.