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addons are not allowed to change the macros/ bindings/ action bar page or any such things during combat... there are addons that can suggest what spell to cast next (like Spell Flash) they highlight the button that they believe you should press... if addons could select a spell you would be able to play WoW with only 1 button... the automation of the game mechanics is something Blizzard does not want addons to be able to do
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