I'd like to see the ability to share and trade items between heroes. If I have a Sword of Awesome, but my first tagged hero is set up to be an archer or mage, I'd like to be able to move the item to another character, or even a "storage" vault or the like back in the capital.
Notably, other games in the Genre, both Age of Wonders and Master of Magic allowed you to do soemthing similar.