Where did you get THAT information? It's 3/4 false.
No, speed does not add up and preplaced interceptors/scarabs will disappear.
I made a tutorial on this. See it here: http://www.staredit.net/index.php?act=tuto...2012+%20Effects AND NO, IT DOES NOT HAVE TO BE PLACED IN THE UPPER LEFT CORNER!! God...
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Thats because no one seems to test or figure things out for themselfs. Personaly i figured out how to do 2x on my own.