It appears that hostile factions allow you to refit your ships at their stations but you are unable to use their repair facilities. It seems weird that one is allowed but not the other, the facilities required for both would probably be similar - although it should be noted that you while you can repair in space given time, you cannot refit certain hull mods like militarized subsystems as you can currently with hostile stations. As such, I would argue that being able to refit is the more important of the two functions but this option is currently permissible while docked while full repairs are not. Given this, I was wondering if being able to refit at hostile stations is intended behavior.