Players in ZS will listen to you if you order them around.
Don't be bossy, just say "Hey, if we do this, then we can get this done a lot faster."
Only a couple times, I played really SRS, and basically commanded all the survivors.
We were holding out in a dark hallway, with six people. 3 of us crouched in a row in front, while the other 3 stood in a line behind the first row.
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We made it to wave 9, without a barricade and against 20 other zombies, mostly fasties.