>And which decent player does that?

The question is irrelevant; I'm just mentioning it to show that someone could do this, then proceed to build as usual and look guilty of map-hacking without ever having cheated. It's just a case of counter-example which prooves that SS's alone aren't enough to condemn someone for cheating. They are a good indicator though (but not proof).

P.S: You'd be surprised with what decent players do sometimes that almost noone has thought of before ;)...