I installed it and was not quite sure what option means what, then found this tidbit on the git pages of the plugin:
The PowerTools has an important limitation over the Steam Deck firmware version, though: it only works while the screen is on.
https://git.ngni.us/NG-SD-Plugins/PowerTools/wiki/FAQ
So unless I misunderstand this I am not sure this is useful when docked since the screen is off, unless in Desktop mode where I am also not sure if this plugin would actually be active?
Thanks for taking time to write this, I think I got it now!