Ok so I think everone heard already about the new "/cast !Auto Shot" macro, but it seems that it can be used for more evil purposes. So, quick 'how to":
1. Make macro
/cast !Auto shot
/cast Aimed Shot(Rank 7)
/script UIErrorsFrame:Clear()
2. Pick a desired target.
3. Start casting Steady Shot ( simple spell without use of any macros )
4. Now when the Steady Shot has been cast you need to clip the incomming Auto Shot with the use of that macro. Meaning after the Steady Shot is done you need to press the macro around 0.1 sec - 0.4 sec after the succesful cast.
5. Profit
I am not fully the autor of this. I saw some movie of a dude doing the double aimed shot posted on filefront then I reproduced it with the use of /cast !Auto Shot
Enjoy while it lasts!