The problem is when using strategic spells on entire armies, having to go to spellbook, find spell, select army, select unit, over and over.

Please add a way to do this faster, either allow to select multiple units with shift or add a hotkey to "cast last spell" or something like that.

Also would be nice if double clicking a unit in a town would select all of the units instead of having to shift click each unit individually.

These are the most important improvements for me.