/props
...keybindings work too... Though, i guess your way works to reduce the clutter of your action bars, I could see it getting confusing having one icon for 3+ abilities.
Using keybindings (and the default blizz ui action bars.. cause i'm cool like that) i did the same thing... i had 1, 2, 3, shift-1,2,3 and alt-1,2,3, except mine were 1,2,3 on the main bar, shift-1,2,3 on the bottom left action bar, and alt-1,2,3,4,5,etc.. was for marking..
whatever floats your boat. i'm not saying "you have to do it my way or you're wrong". much more of a "look at me! i'm cool too" kind of thing.