It's probably not going to work, initially, with macros because it has no way of knowing which spell ties to the target or not. It also requires that the button work with Blizzard's own "IsUsable()" logic. If Bliz can't determine whether or not the macro is currently usable on the current target, nUI won't be able to make the determination, either.
In order to support that sort of thing, I'm going to have to include the ability to specify what spells are associated with the button and that's not going to be able to happen until I get to the more advanced action bar code. Which, very likely, won't happen until after the 3.2 patch.
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