Exit FOR or any loop for that matter would add significant speed to scripts. For instance using WMI. If you want to check for a specific item in let's say WIN32_Product and you know your item is the first one that is available you want to exit the loop when it is reached, not when it's finished cycling trough all installed products. Sure you can count your way there but who's to say that your specific item is in the first place on the second pc.

So I agree with Allen, I'd love to see Exit For/While statements.