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It's odd - the documentation mentions that WSDL generation can be turned off on the individual service level, but it doesn't seem to mention how to do it.
In a quick look at the Axis 1.4 source I can't find any option to do this. One way around this might be to replace the QSWSDLHandler class (which creates the WSDL, and is referenced in the server-config.wsdd file) with your own class that returns nothing. The class is small, and it's not hard to figure out how it would have to be altered in the
invoke method. (If you don't have the source handy, I've placed a copy of the source file
here).
As an aside, you may also want to turn off the global axis.enableListQuery setting.