[SDPhantom]

Originally Posted by CrittenxD How efficient is a list of 60x /use item if only item 60 is in the inventory? Does the Blizzard code for /use item iterate through the whole inventory for each item?

Whatever happens in C code is hidden to us. What we do know is /use is the same as /cast and tells the game to use an ability/item by name. On our end, it's the quickest and most efficient way to do this. If any iteration needs to happen, C code is magnitudes faster at doing it than Lua.

Originally Posted by CrittenxD Does "RegisterForClicks("AnyDown");" check for every single button press if it was R?

This tells the ActionButton which mouse buttons it should listen for. The keybind sends a click event to the ActionButton and it processes the request thinking the user clicked on it.

Originally Posted by CrittenxD How do I bind the button through the key bindings menu? I tried a bunch of different ways to get the CLICK MyMacroButton in there but I am not familiar with xml at all. <Binding name="USEITEM" >(whatdoIwritehere?)</Binding>

To get around the Protected Function issue, what we did is create a protected button which Blizzard supplied a template for us to use and configure to perform the action we want. To trigger the protected button we made, we have to use the built-in CLICK binding command. Unintuitively, you use this command as the name of the binding. You can't define any Lua code within the <Binding> tag anymore when doing this, it will be ignored.

<Binding name="CLICK MyActionButton"/>

If you wish to have the entry come up with a custom name, you need to write it to a specific global in your one of your Lua files.

_G["BINDING_NAME_CLICK MyActionButton"]="Run My Macro";

Note: This global has to be the same name as your binding (this is the CLICK command we set) prefixed by BINDING_NAME_.

Originally Posted by CrittenxD One more thing I ran into is changing the loot key from shift to alt. In my bindings-cache.wtf there is a line 'modifiedclick ALT AUTOLOOTTOGGLE', but how do I do this via SetBinding or something similar?

This is handled in Interface Options, not Keybindings.