Hero Missile Range > 600?

Is there a way to set the range of an attack for a hero unit greater than the default of 600? Whenever I try to push it any higher, it never seems to use the extra range - say I enter 1200 range, it'll still move in to around 600 from the enemy before firing any attacks.

Anyone know how to do this correctly?

ya u gota change the aquisiotion range

and also they might not be able to see the people. Make sure they can see farther than 600

Got it. Thanks, you two. :D