On Windows generally Ethernet interfaces already get a preference over native as the MTU is larger than the tunnel interface. There is no automatic switching though, which is not available in quite a few cases anyway (eg if you have a VPN etc) only tool that does it kinda properly is the one shipped with Thinkpads (Access Connections) but that doesn't support AICCU. It is one the todo list though of things that should be in AICCU. Currently busy testing/playing around with the new GUI edition and a testing mode. This testing mode can detect that connectivity is already present thus we could then avoid building up a tunnel. But this is all future stuff, depending on how much time I have to work on it and if I don't get distracted into doing other things.