I first discovered this post on the Dutch ICT-Freak website, thanks Arne Fokkema. He also created two nice screen shots. The original story came from vinternals.com.
At last! VMware have finally added passthrough auth support in VC 2.5, although it is currently classed as experimental. This is something I have been waiting / asking about for quite some time. And even better, it's on by default! To use it, simply add -passthroughAuth -s vchostname to the end of the shortcut used to launch the VI 2.5 client.