Yeah this is not what I intend. Thanks for your support, Brink, but for now, I am finde with my little AutoIt script. It is not the smartes solution, but at least it does exactly what I want it to...

Thanks for your reply! You are right, option 3 changes the value in the settings immmediately. Still, it does not take effect before restarting the machine.
Option 4 is also not good, because I want...

I have tried option 3 and it worked - but only after restarting the machine. If password is required and I change it via option 3, password is still required after wakeups until I restart the...

Option 2 is not available any more.
Option 3 does not work (any more?) before restarting the machine, which makes it useless.
Same for option 5.
The only option working (without restarting the...