You can't do that in combat; IWT by design is supposed to be triggered by a single hw event and so is any kind of casting

Quote Originally Posted by aasi888 View Post
Wow API has the keyup/keydown actions
https://wowwiki.fandom.com/wiki/UIHANDLER_OnKeyDown
https://wowwiki.fandom.com/wiki/UIHANDLER_OnKeyUp

It would seem like it is possible to do an addon that allows for separate actions for keydown and keyup.
This example only uses the keyUP:
https://wowwiki.fandom.com/wiki/Usin...for_your_addon

In fact Bindpad addon had both key up and down actions implemented back in version 2.2.0 in order to spam faster. Later the author of the mod decided to remove the feature, but the api calls seem to still exist in wow api.



EDIT: So based on this I'm assuming the 1 click -> 1 action rule applies regardless if the ability has GCD or not.