The changes which Heimer needs seem simple in theory (perhaps they are more complicated at the technical level), so Riot's long-standing neglect baffles me. If Riot refuses to do extensive changes, then Heimer's mana costs could at least be reduced. Presently, laying down two turrets, launching rockets plus grenades, and activating UPGRADE!! will leave Heimer with little mana. And if you consider the high probability that one or both turrets can be destroyed in a fight Heimer's mana problems only compound.