Suggestion for improvement: When you move all army from one hero to another, the single unit that is left, is often not the one you want to be left. For example if you have both imps and pikemen then you will have 1 pikeman left instead of the 1 imp you want. Would be nice to have the unit left with a priority like this:
Dragon flie, silver pegasi, obs gargoyle, sprite, serpent flie, harpi hag, royal griffen, centaur captain, wolf raider, storm elemental, hobgoblin, pixie, familiar, wraith, centaur, stone gargoyle, harpy, imp, goblin, skell warrior, gnoll marauder, inf troglodyte, master gremlin, halberdier, gnoll, gremlin, skelleton, troglodyte, pikeman.