@LukeAlmighty my log-in screen just goes to whatever one is recognized as the primary monitor and turned on. if it's turned off it'll just jump down the list of whatever is turned on.
in linux mint i can see it displaying on all windows and the log-in prompt follows the mouse. i don't know if you can actually change what display is the main one right from the log-in screen though.
i'm guessing if you are wanting to do something like that on windows, you might be able to by using a workaround to launch the cmd/powershell on the log-in screen. i'm sure there is a command for doing that.
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