Enable built-in CHDK remote supportYou can use a USB remote trigger without a script. First, ensure you are running a reasonably up-to-date CHDK build. Some early builds did not support remote shutter release control via USB. Now enable remote support via the CHDK menu: Main Menu > Miscellaneous Stuff > Remote Parameters > Enable Remote. See User Manual for details.
If you don't have USB remote enabled, then when you apply 5V to the USB port, the camera switches into "data transfer" mode. The screen will usually go blank or the camera will "beep" as the camera waits from requests from the computer it thinks is attached to the USB port. So if that is what you saw, you were not actually taking pictures when you activated your remote USB switch.
Take a look at the diagram just below the text you quoted from the wiki. It should help explain the various operating modes of the USB remote.
In the mean time I have discovered the alt menu ( it was well hidden )
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