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Distribution and InstallationBack to top
Once you have downloaded components from the Windows Update Corporate site and have stored them on your network server or local machine, use existing internal deployment mechanisms to redistribute files throughout your organization.

Install - Software Updates
The software update installation packages on the Windows Update Corporate site are self-extracting files, which automatically begin the installation process when they are executed. To execute a package double-click it. If you prefer to run setup in quiet mode, without any user interaction, use the following command line switch in your deployment scripts:

Start program_file_name.exe /q

Note Some software updates do require a reboot after install.

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so, as I understood it, there is no way to change the way it works, but you need to use your own mechanism.
but you can use one download for all computers by accessing http://corporate.windowsupdate.microsoft.com/en/default.asp
this is the stuff microsoft tells about it.
maybe some other source reviels more...