A GUI that lists all players, each could be selected and given a dropdown of "always on", "always off", "enabled", "disabled", and "default", where there is an additional setting for default, and enabled and disabled control if the player can toggle their light regardless of it's current state(Possibly with code to preserve the state if they rejoin or respawn)?
Hmm... Tangent time! Idea for an add-on: An administration GUI that lists each player, as well as script-added others, in the left panel, and in the right it shows add-on registered preferences for that client, the whole thing set up as a utility for other add-ons to hook into as an advanced settings GUI, focused on per-player settings to go along with RTB's serverwide settings...