Just to be clear you want to mouse over heal on your tank's interface and have your resto shaman heal?

Getting that to work I find is somewhat easy technically, but the muscle mechanics of it require a finesse. Its definitely a style change.

In this setup example he has a window region defined 36x57x274x631 (something like a grid layout) if your mouse is in that area its going to send w2 some targeted key/mouse actions and his other w# copies are going to do the normal spam (the 2 key) if the mouse isn't in that area, all the copies are going to do the normal spam.

You would have to adapt this to your labels (his are w1,w2,w3,w4) and windows (wow1,wow2,etc) and your UI setup (the grid dimensions (the 36x57x274x631 part)


Code:
<If MouseIsOverWindowRect WoW1 36 57 274 631>
        <SendLabel w2>
            <SaveMousePos>
            <Clickmouse Noclick 60% 60% Norestore>
                    <Key Lctrl 1>
            <Restoremousepos>
        <SendLabel w1, w3, w4, w5>
        <Key 2>
    <Else>
    <SendLabel w1, w2, w3, w4, w5>
        <Key 2>