CRM 2011 - Java interop issues with WCF settings

We have difficulties for calling WCF 4.0 from Java.  With the new CRM Dynamics 2011, web services are using Microsoft WCF 4.0.  In a Microsoft world, it is easy to call WCF services.  However, in Java, we have difficulties for calling WCF 4.0 web services.

It is related to the use of ws-trust and spnego.  We haven't found any implementation of spnego in the Java world (other than Websphere … ).

spnego is not interoperable.  We have to change the WCF service to other settings.  Transport security looks like the most interoperable. x.509 in the message could be also ok

However, we have been told that we can not change any WCF settings on the CRM 2011 server.  Could someone confirm that to me?

Could someone help us?

Thanks !