I have tried that and they just seem to walk around by the Core rather than hanging near where the enemy come from. Does it need 2 Command Centres to work?
I'm also curious. A command center, or even two of them, don't seem to have any effect on anything. I've tried selecting the different options of patrol, attack, and retreat.
I've just seen that Anuken has reworked the Command Center and the Attack command is now supposed to set mechs to move towards spawn point. Patrol is now "Rally" so will have to see how that works too :)