This macro will only work with Quartz; a casting bar that shows you when you can press escape/move when you're casting and have the cast still go off. This addon can be found at http://wow-en.curse-gaming.com/downloads/details/7960/
The Macro-
Something along the lines of...
/asdf
/asdf
(repeat)
/stopcasting
/cast *Spell*
You click the macro once, it creates lag, and the Quartz casting bar will show a half cast. Once the cast bar gets to the *stop casting area* you press the macro again and it cancels the current cast and starts another. Try it out =P
If this doesnt work for you, you can reduce your casting speed a little by just using...
/stopcasting
/cast *Spell*
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