how get VMWare Fusion's internal VPN to pass along the Window's logo key?

I'm also posting this at VMWare Communities, with no replies so far.

VMWare Fusion (5) has an internal VPN, which I find helpful and faster than tunnelling (SSH) into my Mac from somewhere else on the Net, and then using Fusion as usual. With the internal VPN, I go straight to Windows (8), bypass the Mac interface entirely, and that used to be faster to interact with it that way.

Now, having upgraded to Windows 8 (from Vista!), I need the Windows logo key - using the mouse is too slow and inaccurate to call up the Charms bar, for example. Windows logo + C works like a ... charm!

So, tunnelling into my iMac (from afar) and using "Windows logo" keystrokes in Fusion works fine.

But tunnelling directly into Fusion, using its internal VPN (Settings -> Advanced), does not work.

There are several options to set for "Keyboard and Mouse" but I haven't found a combo which works.

Missing anything?

Thanks to all.

Charles