Shinigami eyes..

i think if someone has a real death note in there inventory and someone with shinigami eyes does the verb it should block the life span like how a mask blocks the name that could help the rp in to ways one helping other kiras find other kiras and if L gets ahold of a death note and gets ownership makes it a little easier for him to catch kira if he finds out.

Shinigami can see the lifespan of DN owners, though, which means there'd need to be both Shinigami-type and human-type Shinigami Eyes verbs.

Yes, as Rey said, we would need more than one type of eyes of the Shinigami. Although it wouldn't be hard to code ... I don't see why K wouldn't do this.