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That's not how a binding works. Down is what to do when the key is pressed, i.e. what function to execute, and not what key is bound. Think about it, DOWN what? The key assigned. You don't need an addon because the game provides an interface to do exactly what you're describing. Just go into controls and set the key binding to whatever you like. You only need a key binding in an addon if you want to bind a key to an action not already there, like the window for your addon. You've made this far more complicated than it actually is. You can use the modifier keys when do the assignment.
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