No doubt, Tailscale people are awesome. From a security perspective, I would design this feature differently. If the capability to change the control server ex

No doubt, Tailscale people are awesome. From a security perspective, I would design this feature differently. If the capability to change the control server exists, then, rather than hiding it, I would want to see a prominent UI element displaying the control server name, url and "more details" to the user to see before they connect/login. This is important to prevent any social engineering based security hacks.