I think a random example will provide the best explanation of what i am asking:
Upon pressing the button 3 (keybinding for my macro) a single target nuke spell is casted.
Then i press something like "CTRL + 3" and my single target nuke spell turns into my AoE nuke spell (changes on the action bar).
It stays like that until i again press the "CTRL + 3" modifier, upon which the macro turns back into the single target nuke.
I already know of the ctrl/shift modifiers that will cast a different spell WHILE HOLDING the modifier button.
What i am looking for is a way to make the different spell replace the previous spell, until i press the modifier button again.
Or, in other words, i don't want to have to press the modifier key every time i want to trigger the alternate spell - i just wanna toggle between the two spells.
Does anyone know of such a macro?