Support the deployment of multiple WSDL used in a single process. Let's say you have 10 web services and also 10 processes. All your processes use several and sometimes even all of the web services. Right now you'll have to build 10 other WSDL documents by copying and pasting the content of your web services WSDL docs to match those needed by your processes.
The idea here would be to deploy all the WSDL documents specific to your services and directly use them in your BPEL process through their namespaces.