What about if a player is wearing a player head then he can activate retinal scanners that accept this player? After all, it's meant to be scanning the players eyes so there shouldn't be any difference between the real head or a head item. I don't know if it's a good feature thought as there is no vanilla survival way to obtain them as far as I know and it may make intruding in ones base way easier in some situations. I just think it would be cool.

This is already part of the mod. You need to enable the trick_scanners_with_player_heads server config setting.

Ok thanks!