You can adjust the route metric using `PostUp`, if you need: https://git.zx2c4.com/wireguard-windows/about/docs/adminregistry.md
But having WireGuard automatically _shutoff_ due to unreachability sounds like something with DoS security implications, so we're unlikely to add that to the client. However you might be able to trigger various rules to enable or disable WireGuard using other OS facilities. https://git.zx2c4.com/wireguard-windows/about/docs/enterprise.md may help. Jason
