Sadly not. I'd like to change it too, but Guard Radius iz based on each of your units "VisionRange" or "AttackRange", I can't remember which one exactly...
My guinea pig unit at the moment is the Chinese Nuke Cannon. I set the attack range, sight radius, and shroud clearing to 700...but I think there must be a maximum value for shroud-clearing, because they can shoot farther than they can see.
Nevermind, it seems that the game doesn't want to listen when I change sight radius values in the .ini file. Set the Red Guard's shroud-clear to 1400, did nothing.
Anyone else ever have problems with the game not acknowledging what you put in the .ini?