HI! I came to this forum to ask the same! LoL! Now i tell you how he make that:
He make a crosshair on his Monitor and use a script, what does this:
first it zoom 2 times! Then he Shoot! Next it switch to knife or secweapon-primary! and then again to awp! If he hold the fire key it keeps in zoom stage till you release! Here is the forum thread from him: http://forums.steampowered.com/forums/showthread.php?s=3e77a0545adbbc65a61605efe786ed62&threadid=326022&perpage=15&pagenumber=1
Plz can somebody make this script!? That would be very n1!