Condensing My Macro's

I've always been a bit slow when it comes to doing macro's in wow, and they have always been a little basic.

However, I've been level 70 for a just over a week now, and I have started to realise that I could condense a few of my macro's and have less buttons to press, instead of having spider hands and trying to move all over the keyboard.

I've successfully done alot of them, however, the two which i cannot seem to condense into one is these.

Code:

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On [F3] I Have:
/use vengeance of the illidari
/cast elemental mastery
/cast nature's swiftness
/cast [target=focustarget] chain lightning

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Code:

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On [3] I Have:
/cast [target=focustarget] chain lightning

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i wanted to combine them so that i do a normal chain lightning when i press [3], and then the top one when i do [SHIFT]+[3]

but for the life of me, i have no idea what im doing wrong, it never works, and im wondering if its possible to slap target assignments and multiple uses onto a modifier line.

anyone could enlighten me on this matter, once i've solved this, ill be able to learn from it and finish off the others myself.

hmm after a little sleep, it seems i managed to come up with a working one, no idea if its the most economical or not.

Code:

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/use [modifier:shift] vengeance of the illidari
/cast [modifier:shift] elemental mastery
/cast [modifier:shift] nature's swiftness
/cast [modifier:shift, target=focustarget] chain lightning
/cast [target=focustarget] chain lightning

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anyone verify this is ok, it works well ingame, but there might be an easier way.

what if you do this

Code:

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/cast elemental mastery
/stopcasting
/cast [target=x] chain lightning

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should pop the elemental mastery, if available, adn then the chain lightning

Make sure that you unbind shift-3 (normally switches pages) or it wont work.