Just want to plug in your WindowsCE based device and not create a partnership? Well if that’s the case you no doubt have to go through the wizard each and every time you dock your device.
But! There is a registry tweak for ActiveSync to force GuestOnly mode. This pretty much disables ActiveSync and just allows connection to the PC.
Just add the registry entry:
[HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows CE Services]