The EnableLUA is one of the most idiotic settings ever. As you have found, the slider can be all the way to the bottom, but the UAC still works. With this RegSetting it is "REALLY REALLY" off.

If you are disabling LinkedConnections you are at the very least getting yourself back to being in an environment that MS approves of. And, with Windows 10, having that EnableLUA on, apps like Edge will not work, so again it looks like you are going in the right direction.