This is an excelent mod.
Totally needed to familiarize with the game units in a short time.
Also good for playing araund aimless.
Remember to run a server with password is required. Otherwise it fails with "access denied" message.
Example:
SERVER:
start UDK.exe server CNC-Field?mutator=Rx_CreativeMode.Rx_CreativeMode?AdminPassword=admin?
NODBotCount=3?GDIBotCount=3 -port=7777
CLIENT:
~ or F5 to bring the game console, then type, "/login admin" (without quotes) command and press enter to start.