Casting spells on stacks
I would find it convenient if I coulds cast a spell on several units at once. Currently I can only select on of the units and have to open the spellbook 9 times to cast a spell on every unit. Would it be possible to select several units just by clicking once on each and then cast the spell on all selected units? The selection should work kind like a checkbox. On click selects the unit and another click deselects it again. I don't think it is an important feature but sometimes it would be very conveniant.