The only other DL suggestion I have is to include line-of-sight for walls. It makes sense a character can see where a torch is shedding light from a friend, where someone with darkvision is the only one who can see their light. The only complaint I have is that if there's a 5 foot stone wall between the group and a light source, they can see the entire room behind the closed door! would make more sense to only allow a character to see squares that are in their LOS