Lets say you have Zealots,Dragoon and High Templar hotkeyed in a squad.

Is it unreasonable to type 't' for psisstorm and have it cast without having to select the High Templars by themselves.

Or is this already in the game?

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Q u o t e:
Lets say you have Zealots,Dragoon and High Templar hotkeyed in a squad.

Is it unreasonable to type 't' for psisstorm and have it cast without having to select the High Templars by themselves.

Or is this already in the game?

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Yup, currently they work similarly with Warcraft III. When you have a group selected of various types of units, when you hit 'tab' it will cycle thorough those various groups. This will be a key skill to master when dealing with large group battles in which those abilities cast could turn the battle.