Just want to start off with saying that LH is a marked improvement.  I love the potential this game has.

A few things do bug me like combat and heroes.  I play a custom Krax race with a non-magic sovereign and I like my big armies.  So the best class for my sovereign is a commander, but commander class has no personal combat buffs and he's stuck with leather armor.  While my warrior is wearing plate and doing damage like no one's business but his army lacks the passives provided by my commander.  So instead of focusing on just improving the heroes through their various skill trees, give them some army buffs as well.  Put heroes in a more army general style position instead of making a one of a kind unit a step above my cookie cutter soldiers.  Let commander have some combat ability, guardian is fine, assassins should give something akin to stealth to an army strategically, warriors should inspire some aggression in their troops, and mages could give a little spell resistance or something.