Based on a quick perusal of that link... this mod looks like a lot like EQ2's custom macro system.
Just open the macro window and you can create a macro that will cast things or do any number of other things (essentially almost anything you can do via a / command). The major limitation is that you cannot insert a pause. But you can do many things, and then just drag the macro onto a hotbar.
If you're looking for something that does something else, please state specifically what you are looking for. EQ2's UI is very different from the UI in that other game and mods (and even ideas) don't necessarily translate well.
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