Good to see people still using HKN. Isboxer is for clickers.

Why just 2 keys? For my single target tanking I have 7 and for aoe I have 6. I use ctl-alt-shift-2 to switch between them using what I think is clever use of SetToggle. (Notice the two toggle loops in a single hotkey). When I have 3 holy power I hit alt-2. It is not a perfect 939 of course but it seems to be close enough dps-wise on a dummy and was much better than the stickied 2-step. (if there is a better way to evaluate it let me know)

Every other toon for now is just doing 2 keys but with my script that can be changed individually very quickly.
Code:
<Hotkey ScrollLockOff 2>
    <DoHotkey Hotkey LAlt Hangul>  //toon1
    <DoHotkey Hotkey RAlt Hangul>  //toon2
    <DoHotkey Hotkey LShift Hangul>  //and so on
    <DoHotkey Hotkey RShift Hangul>
    <DoHotkey Hotkey RCtrl Hangul>

<Hotkey lctrl lalt lshift 2>
    <Toggle>
	<SetToggle 8 Hotkey LAlt Hangul>  //aoe rotation
    <Toggle>
	<SetToggle 1 Hotkey LAlt Hangul>  //single target

<Hotkey LAlt Hangul>
    <Toggle>
        <SendLabel w1>
            <Key lctrl lalt lshift a>
    <Toggle>
        <SendLabel w1>
            <Key lctrl lalt lshift s>
    <Toggle>
        <SendLabel w1>
            <Key lctrl lalt lshift d>
    <Toggle>
        <SendLabel w1>
            <Key lctrl lalt lshift f>
    <Toggle>
        <SendLabel w1>
            <Key lctrl lalt lshift g>
    <Toggle>
        <SendLabel w1>
            <Key lctrl lalt lshift h>
    <Toggle>
        <SendLabel w1>
            <Key lctrl lalt lshift j>
	    <SetToggle 1 Hotkey LAlt Hangul>
// toggles 8-13 are for aoe tank rotation
    <Toggle>
        <SendLabel w1>
            <Key lalt lshift a>
    <Toggle>
        <SendLabel w1>
            <Key lalt lshift s>
    <Toggle>
        <SendLabel w1>
            <Key lalt lshift d>
    <Toggle>
        <SendLabel w1>
            <Key lalt lshift f>
    <Toggle>
        <SendLabel w1>
            <Key lalt lshift g>
    <Toggle>
        <SendLabel w1>
            <Key lalt lshift h>
	    <SetToggle 8 Hotkey LAlt Hangul>

// rest of the sequences for each toon are after this and are just dual toggles separately for each