Ok, You can't see exits
When people arrive/leave its someone if they aren't sneaking.
You can't see exits you have to exit or look around to find the exits
Scanning is pointless
When the person is invis/camo/etc You will not beable to see them at all even if you have something that lets you see it
To see people in rooms You have to Look, when you arrive you just see someone.

Wow, this actually isn't a bad idea