Voilla!
Since what you asked for is not possible with a batch script, I turned my head towards WSH. So you guys can find enclosed a small vb script, which you can test. If your Windows installation is somehow missing wscript, then you're out of luck, but normally, it should be there.
The script will prompt you to enter the Qt instalation root, such as C:\Qt\4.3.2 and it will do the work from there.
Currently it creates shortcuts for all the 4 tools and command prompt, and also creates a qtvars.bat which sets the environment. The makespec is hardcoded to win32-g++.
To run the script, just double-click it.
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